*SET-U

English word origin

Etymology of isn't

Etymology tree Proto-Indo-European *h₁es- Proto-Indo-European *h₁ésti Proto-Germanic *isti Proto-West Germanic *ist Old English is Middle English is English is Proto-Indo-European *né Proto-Germanic *ne Proto-West German

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In this entry · 1 source sections

The source etymologies

Wiktionary via Kaikki / Wiktextract

The source reports below are imported and unreviewed by *SET-U. Separate numbered origins and differing source variants are preserved; agreement within this extraction is not independent corroboration.

Unnumbered source etymology

Original entry ↗
verb

Contraction of is + not (negative auxiliary).

noun

Something or someone that is defined by the lack of the characteristic being discussed.

Selected source glosses provide context, not a complete modern definition inventory

Etymology tree Proto-Indo-European *h₁es- Proto-Indo-European *h₁ésti Proto-Germanic *isti Proto-West Germanic *ist Old English is Middle English is English is Proto-Indo-European *né Proto-Germanic *ne Proto-West Germanic *ne Proto-Indo-European *h₂ey- Proto-Indo-European *-u Proto-Indo-European *h₂óyu Proto-Indo-European *-osinflu. Proto-Germanic *aiwaz Proto-West Germanic *aiw univ. Proto-West Germanic *naiw Proto-Indo-European *wekʷ- Proto-Indo-European *-tis Proto-Indo-European *wékʷtisder.? Proto-Indo-European *weǵʰ- Proto-Indo-European *-tis Proto-Indo-European *wéǵʰtisder.? Proto-Germanic *wihtą Proto-West Germanic *wiht Proto-West Germanic *naiwwiht Old English nāwiht Old English *nōht Middle English nought Middle English not English notder. English -n't English isn't From is + -n't.

Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

{
  "templates": [
    {
      "name": "ety",
      "args": {
        "1": "en",
        "2": ":af",
        "3": "is",
        "4": "-n't",
        "text": "+",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *h₁es-\nProto-Indo-European *h₁ésti\nProto-Germanic *isti\nProto-West Germanic *ist\nOld English is\nMiddle English is\nEnglish is\nProto-Indo-European *né\nProto-Germanic *ne\nProto-West Germanic *ne\nProto-Indo-European *h₂ey-\nProto-Indo-European *-u\nProto-Indo-European *h₂óyu\nProto-Indo-European *-osinflu.\nProto-Germanic *aiwaz\nProto-West Germanic *aiw\nuniv.\nProto-West Germanic *naiw\nProto-Indo-European *wekʷ-\nProto-Indo-European *-tis\nProto-Indo-European *wékʷtisder.?\nProto-Indo-European *weǵʰ-\nProto-Indo-European *-tis\nProto-Indo-European *wéǵʰtisder.?\nProto-Germanic *wihtą\nProto-West Germanic *wiht\nProto-West Germanic *naiwwiht\nOld English nāwiht\nOld English *nōht\nMiddle English nought\nMiddle English not\nEnglish notder.\nEnglish -n't\nEnglish isn't\n[Appendix:Glossary#inherited|Inherited]] from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Proto-Germanic\", \"term\" : \"*isti\", \"status\" : \"ok\", \"lang\" : \"gem-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Proto-West Germanic\", \"term\" : \"*ist\", \"status\" : \"inline\", \"lang\" : \"gmw-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Old English\", \"term\" : \"is\", \"lang\" : \"ang\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Middle English\", \"term\" : \"is\", \"lang\" : \"enm\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"English\", \"term\" : \"is\", \"status\" : \"ok\", \"lang\" : \"en\" }, { \"children\" : [ { \"keyword_abbrev\" : \"der.\", \"keyword_label\" : \"Derived from\", \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"alt\" : \"nāwiht\", \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"keyword_abbrev\" : \"univ.\", \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ ], \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*né\", \"status\" : \"ok\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Proto-Germanic\", \"term\" : \"*ne\", \"status\" : \"ok\", \"lang\" : \"gem-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Proto-West Germanic\", \"term\" : \"*ne\", \"status\" : \"inline\", \"lang\" : \"gmw-pro\" }, { \"id\" : \"time\", \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"id\" : \"life\", \"children\" : [ ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*h₂ey-\", \"lang\" : \"ine-pro\" }, { \"alt\" : \"*-u\", \"lang_name\" : \"Proto-Indo-European\", \"status\" : \"ok\", \"children\" : [ ], \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"From\", \"is_group\" : true, \"keyword\" : \"affix\" } ], \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*h₂óyu\", \"status\" : \"ok\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" }, { \"keyword_abbrev\" : \"influ.\", \"keyword_label\" : \"Influenced by\", \"terms\" : [ { \"id\" : \"thematic\", \"children\" : [ ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*-os\", \"lang\" : \"ine-pro\" } ], \"keyword\" : \"influence\" } ], \"lang_name\" : \"Proto-Germanic\", \"term\" : \"*aiwaz\", \"status\" : \"ok\", \"lang\" : \"gem-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Proto-West Germanic\", \"term\" : \"*aiw\", \"lang\" : \"gmw-pro\" } ], \"keyword_label\" : \"Univerbation of\", \"is_group\" : true, \"keyword\" : \"univerbation\" } ], \"lang_name\" : \"Proto-West Germanic\", \"term\" : \"*naiw\", \"status\" : \"inline\", \"lang\" : \"gmw-pro\" }, { \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"keyword_abbrev\" : \"der.\", \"is_uncertain\" : true, \"keyword_label\" : \"Derived from\", \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ ], \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*wekʷ-\", \"status\" : \"ok\", \"lang\" : \"ine-pro\" }, { \"children\" : [ ], \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*-tis\", \"status\" : \"ok\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"From\", \"is_group\" : true, \"keyword\" : \"affix\" } ], \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*wékʷtis\", \"status\" : \"inline\", \"lang\" : \"ine-pro\" }, { \"children\" : [ { \"terms\" : [ { \"children\" : [ ], \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*weǵʰ-\", \"status\" : \"ok\", \"lang\" : \"ine-pro\" }, { \"is_duplicate\" : true, \"children\" : [ ], \"status\" : { \"1\" : \"ine-pro\", \"id\" : \"action nouns\", \"pos\" : \"suffix\" }, \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*-tis\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"From\", \"is_group\" : true, \"keyword\" : \"affix\" } ], \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*wéǵʰtis\", \"status\" : \"inline\", \"lang\" : \"ine-pro\" } ], \"keyword\" : \"derived\" } ], \"lang_name\" : \"Proto-Germanic\", \"term\" : \"*wihtą\", \"status\" : \"ok\", \"lang\" : \"gem-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Proto-West Germanic\", \"term\" : \"*wiht\", \"status\" : \"inline\", \"lang\" : \"gmw-pro\" } ], \"keyword_label\" : \"From\", \"is_group\" : true, \"keyword\" : \"affix\" } ], \"lang_name\" : \"Proto-West Germanic\", \"term\" : \"*naiwwiht\", \"status\" : \"ok\", \"lang\" : \"gmw-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" }, { \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"is_duplicate\" : true, \"gloss\" : \"not\", \"children\" : [ ], \"status\" : [ \"gem-pro\", \":inh\", \"ine-pro:*né\" ], \"lang_name\" : \"Proto-Germanic\", \"term\" : \"*ne\", \"lang\" : \"gem-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Old English\", \"term\" : \"ne\", \"status\" : \"ok\", \"lang\" : \"ang\" }, { \"children\" : [ ], \"lang_name\" : \"Old English\", \"term\" : \"āwiht\", \"status\" : \"missing\", \"lang\" : \"ang\" } ], \"is_group\" : true, \"keyword\" : \"afeq\", \"is_invisible\" : \"all\" } ], \"lang_name\" : \"Old English\", \"term\" : \"nāwiht\", \"status\" : \"ok\", \"lang\" : \"ang\" } ], \"keyword_label\" : \"From\", \"keyword\" : \"from\" } ], \"lang_name\" : \"Old English\", \"term\" : \"*nōht\", \"status\" : \"inline\", \"lang\" : \"ang\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" }, { \"terms\" : [ { \"children\" : [ ], \"lang_name\" : \"Middle English\", \"term\" : \"ne\", \"status\" : \"missing\", \"lang\" : \"enm\" }, { \"children\" : [ ], \"lang_name\" : \"Middle English\", \"term\" : \"ought\", \"status\" : \"missing\", \"lang\" : \"enm\" } ], \"is_group\" : true, \"keyword\" : \"afeq\", \"is_invisible\" : \"all\" } ], \"lang_name\" : \"Middle English\", \"term\" : \"nought\", \"status\" : \"ok\", \"lang\" : \"enm\" } ], \"keyword_label\" : \"From\", \"keyword\" : \"from\" } ], \"lang_name\" : \"Middle English\", \"term\" : \"not\", \"status\" : \"ok\", \"lang\" : \"enm\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"English\", \"term\" : \"not\", \"status\" : \"ok\", \"lang\" : \"en\" } ], \"keyword\" : \"derived\" } ], \"lang_name\" : \"English\", \"term\" : \"-n't\", \"status\" : \"ok\", \"lang\" : \"en\" } ], \"keyword_label\" : \"From\", \"is_group\" : true, \"keyword\" : \"affix\" } ], \"lang_name\" : \"English\", \"term\" : \"isn't\", \"status\" : \"ok\", \"lang\" : \"en\" }\" data-lang=\"en\" data-title=\"isn't\">\nFrom is + -n't."
    },
    {
      "name": "ety",
      "args": {
        "1": "en",
        "2": ":af",
        "3": "is",
        "4": "-n't",
        "text": "+",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *h₁es-\nProto-Indo-European *h₁ésti\nProto-Germanic *isti\nProto-West Germanic *ist\nOld English is\nMiddle English is\nEnglish is\nProto-Indo-European *né\nProto-Germanic *ne\nProto-West Germanic *ne\nProto-Indo-European *h₂ey-\nProto-Indo-European *-u\nProto-Indo-European *h₂óyu\nProto-Indo-European *-osinflu.\nProto-Germanic *aiwaz\nProto-West Germanic *aiw\nuniv.\nProto-West Germanic *naiw\nProto-Indo-European *wekʷ-\nProto-Indo-European *-tis\nProto-Indo-European *wékʷtisder.?\nProto-Indo-European *weǵʰ-\nProto-Indo-European *-tis\nProto-Indo-European *wéǵʰtisder.?\nProto-Germanic *wihtą\nProto-West Germanic *wiht\nProto-West Germanic *naiwwiht\nOld English nāwiht\nOld English *nōht\nMiddle English nought\nMiddle English not\nEnglish notder.\nEnglish -n't\nEnglish isn't\nFrom is + -n't."
    }
  ],
  "links": [
    [
      "*h₁es-",
      "Reconstruction:Proto-Indo-European/h₁es-#Proto-Indo-European:_be"
    ],
    [
      "*h₁ésti",
      "Reconstruction:Proto-Indo-European/h₁ésti"
    ],
    [
      "*isti",
      "Reconstruction:Proto-Germanic/isti"
    ],
    [
      "*ist",
      "Reconstruction:Proto-West Germanic/ist"
    ],
    [
      "is",
      "is#Old_English:_be"
    ],
    [
      "is",
      "is#Middle_English:_be"
    ],
    [
      "is",
      "is#English"
    ],
    [
      "*né",
      "Reconstruction:Proto-Indo-European/né"
    ],
    [
      "*ne",
      "Reconstruction:Proto-Germanic/ne"
    ],
    [
      "*ne",
      "Reconstruction:Proto-West Germanic/ne"
    ],
    [
      "*h₂ey-",
      "Reconstruction:Proto-Indo-European/h₂ey-#Proto-Indo-European:_life"
    ],
    [
      "*h₂óyu",
      "Reconstruction:Proto-Indo-European/h₂óyu"
    ],
    [
      "*-os",
      "Reconstruction:Proto-Indo-European/-os#Proto-Indo-European:_thematic"
    ],
    [
      "*aiwaz",
      "Reconstruction:Proto-Germanic/aiwaz"
    ],
    [
      "*aiw",
      "Reconstruction:Proto-West Germanic/aiw#Proto-West_Germanic:_time"
    ],
    [
      "*naiw",
      "Reconstruction:Proto-West Germanic/naiw"
    ],
    [
      "*wekʷ-",
      "Reconstruction:Proto-Indo-European/wekʷ-"
    ],
    [
      "*-tis",
      "Reconstruction:Proto-Indo-European/-tis"
    ],
    [
      "*wékʷtis",
      "Reconstruction:Proto-Indo-European/wékʷtis"
    ],
    [
      "*weǵʰ-",
      "Reconstruction:Proto-Indo-European/weǵʰ-"
    ],
    [
      "*-tis",
      "Reconstruction:Proto-Indo-European/-tis"
    ],
    [
      "*wéǵʰtis",
      "Reconstruction:Proto-Indo-European/wéǵʰtis"
    ],
    [
      "*wihtą",
      "Reconstruction:Proto-Germanic/wihtą"
    ],
    [
      "*wiht",
      "Reconstruction:Proto-West Germanic/wiht"
    ],
    [
      "*naiwwiht",
      "Reconstruction:Proto-West Germanic/naiwwiht"
    ],
    [
      "nāwiht",
      "nawiht#Old_English"
    ],
    [
      "*nōht",
      "Reconstruction:Old English/noht"
    ],
    [
      "nought",
      "nought#Middle_English"
    ],
    [
      "not",
      "not#Middle_English"
    ],
    [
      "not",
      "not#English"
    ],
    [
      "-n't",
      "-n't#English"
    ],
    [
      "is",
      "is#English"
    ],
    [
      "-n't",
      "-n't#English"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "verb",
      "glosses": [
        "Contraction of is + not (negative auxiliary)."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "contraction"
      ],
      "recordId": "48339675c16fa81530594bffcee4eb5a6a370bb1feb114fd431ba16de6e2366a",
      "rawRecordSha256": "8ea7e703c67a142a1734126ef64a24c12b160af000aa96f9022a1f426a4de2b7",
      "sourceRecordOrdinal": 159489
    },
    {
      "pos": "noun",
      "glosses": [
        "Something or someone that is defined by the lack of the characteristic being discussed."
      ],
      "tags": [
        "colloquial",
        "nonstandard"
      ],
      "recordId": "d385ea37812eba6939b827ab178c7ba42541a3a1a8064f64c1d120ca95dcab8f",
      "rawRecordSha256": "4c213552c28ff64fc58d36c5069eb7e0f3f6dfe6d3bda4207ce1b105650a0027",
      "sourceRecordOrdinal": 159490
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
    "references": 0,
    "descendants": 0,
    "lexicalRecords": 0,
    "lexicalSenses": 0,
    "glosses": 0
  }
}

Where this record stops

This page does not supply an independently verified sound-change sequence, first-use manuscript or complete family tree unless a cited analysis explicitly establishes one. Missing detail here is a limit of this record—not a claim that humanity knows nothing more.

An older meaning does not determine what a word must mean today. Follow the sources, preserve disagreements, and keep ancestry separate from interpretation.

Contribute located evidence for isn't →

Source and snapshot

Imported from Wiktionary contributors; extracted by Tatu Ylonen / Wiktextract / Kaikki.org. Selected fields are reformatted and grouped; wording, source identity and etymology sections are retained. CC-BY-SA-4.0 applies to the imported source material.

Dump: 2026-10-01 · Extracted: 2026-10-30. These are snapshot dates, not the word’s first attestation or the page’s revision date.

Source entry and bibliography ↗Wiktionary revision history ↗Acquisition and rights ledger
Machine-source provenance
Source SHA-256
5ff2c072f8099f2d2ce484bd6957bf179f046d2ad37bc36555edf8bb84cb5291
Import run
73216b9a9b78ed3830994bf853103716f5a4dc57099e371e9f8fdc468facca26
Permanent entry ID
w-aXNuJ3Q