Old Dutch fīunt is the normalized headword behind a twenty-six-occurrence historical-dictionary record for enemy or opponent. ONW classifies the noun as synchronically unsegmented but says it was originally the present participle of the verb corresponding to Old High German fīēn and Gothic fijan, a verb no longer known in Dutch. Its frequency table preserves six case-number cells: nominative and genitive singular plus nominative, genitive, dative, and accusative plural. Those are not a complete paradigm. The article displays twenty representative location blocks after warning that locations in the semantic profile have been reduced. Most early Wachtendonck Psalms material is linguistically dated 901–1000 but survives in copies dated 1595–1605, circa 1598, or 1701–1800; no tenth-century manuscript object was inspected. One dfiunt or fiunt gloss aligned with Latin diabolus is textually disputed, and one Groningen psalm gloss is explicitly assigned to Old Frisian by the dictionary. This dossier therefore treats fīunt as a nominal fossil with a partially preserved inflectional record, not as a productive Old Dutch participle or a complete transparent paradigm.