*SET-U

English word origin

Etymology of sly

From Middle English sly, sley, sleigh, sleiȝ, from Old Norse slǿgr (“sly, cunning”, literally “capable of hitting or striking”), from Proto-Germanic *slōgiz (“lively, agile, cunning, sly, striking”), from Proto-Indo-Euro

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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 ↗
adv

Slyly.

adj

Artfully cunning; secretly mischievous; wily. · Dexterous in performing an action, so as to escape notice. · Done with, and marked by, artful and dexterous secrecy; subtle · Light or delicate; slight; thin.

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

From Middle English sly, sley, sleigh, sleiȝ, from Old Norse slǿgr (“sly, cunning”, literally “capable of hitting or striking”), from Proto-Germanic *slōgiz (“lively, agile, cunning, sly, striking”), from Proto-Indo-European *slak- (“to hit, throw”). Cognate with Icelandic slægur (“crafty, sly”), Norwegian Nynorsk sløg (“sly”). Related to sleight, slay. In all likelihood, however, unrelated with Saterland Frisian slau (“sly, crafty”), Dutch sluw (“sly, cunning”), Low German slu (“sly, cunning”), German schlau (“clever, crafty”). Doublet of sleight and slöjd

Relationships mentioned by the source

These are extracted mentions, not a timeline or a verified sequence of immediate parents.

  • Inherited-form mentionslyenm
  • Derivation mentionslǿgrnon · sly, cunning
  • Derivation mention*slōgizgem-pro · lively, agile, cunning, sly, striking
  • Derivation mention*slak-ine-pro · to hit, throw
  • Cognate mentionslæguris
  • Cognate mentionsløgnn
  • Cognate mentionslaustq
  • Cognate mentionsluwnl
  • Cognate mentionslunds
  • Cognate mentionschlaude
  • Doublet mentionsleighten
  • Doublet mentionslöjden
Inspect preserved source fields

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

{
  "templates": [
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "enm",
        "3": "sly"
      },
      "expansion": "Middle English sly"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "non",
        "3": "slǿgr",
        "t": "sly, cunning",
        "lit": "capable of hitting or striking"
      },
      "expansion": "Old Norse slǿgr (“sly, cunning”, literally “capable of hitting or striking”)"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "gem-pro",
        "3": "*slōgiz",
        "t": "lively, agile, cunning, sly, striking"
      },
      "expansion": "Proto-Germanic *slōgiz (“lively, agile, cunning, sly, striking”)"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*slak-",
        "t": "to hit, throw"
      },
      "expansion": "Proto-Indo-European *slak- (“to hit, throw”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "is",
        "2": "slægur",
        "3": "",
        "4": "crafty, sly"
      },
      "expansion": "Icelandic slægur (“crafty, sly”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "nn",
        "2": "sløg",
        "3": "",
        "4": "sly"
      },
      "expansion": "Norwegian Nynorsk sløg (“sly”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "stq",
        "2": "slau",
        "3": "",
        "4": "sly, crafty"
      },
      "expansion": "Saterland Frisian slau (“sly, crafty”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "nl",
        "2": "sluw",
        "3": "",
        "4": "sly, cunning"
      },
      "expansion": "Dutch sluw (“sly, cunning”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "nds",
        "2": "slu",
        "3": "",
        "4": "sly, cunning"
      },
      "expansion": "Low German slu (“sly, cunning”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "de",
        "2": "schlau",
        "3": "",
        "4": "clever, crafty"
      },
      "expansion": "German schlau (“clever, crafty”)"
    },
    {
      "name": "doublet",
      "args": {
        "1": "en",
        "2": "sleight",
        "3": "slöjd"
      },
      "expansion": "Doublet of sleight and slöjd"
    }
  ],
  "links": [
    [
      "sly",
      "sly#Middle_English"
    ],
    [
      "sley",
      "sley#Middle_English"
    ],
    [
      "sleigh",
      "sleigh#Middle_English"
    ],
    [
      "sleiȝ",
      "sleiȝ#Middle_English"
    ],
    [
      "slǿgr",
      "slǿgr#Old_Norse"
    ],
    [
      "*slōgiz",
      "Reconstruction:Proto-Germanic/slōgiz"
    ],
    [
      "*slak-",
      "Reconstruction:Proto-Indo-European/slak-"
    ],
    [
      "slægur",
      "slægur#Icelandic"
    ],
    [
      "sløg",
      "sløg#Norwegian_Nynorsk"
    ],
    [
      "sleight",
      "sleight#English"
    ],
    [
      "slay",
      "slay#English"
    ],
    [
      "slau",
      "slau#Saterland_Frisian"
    ],
    [
      "sluw",
      "sluw#Dutch"
    ],
    [
      "slu",
      "slu#Low_German"
    ],
    [
      "schlau",
      "schlau#German"
    ],
    [
      "sleight",
      "sleight#English"
    ],
    [
      "slöjd",
      "slöjd#English"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "adv",
      "glosses": [
        "Slyly."
      ],
      "tags": [],
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    {
      "pos": "adj",
      "glosses": [
        "Artfully cunning; secretly mischievous; wily.",
        "Dexterous in performing an action, so as to escape notice.",
        "Done with, and marked by, artful and dexterous secrecy; subtle",
        "Light or delicate; slight; thin."
      ],
      "tags": [],
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  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
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    "lexicalRecords": 0,
    "lexicalSenses": 0,
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}

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 sly →

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-c2x5