LATIN DICTIONARYLexicon Latīnum
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“foolish” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

foolish
stultus (foolish, from want of practical wisdom, μωρός; opposed to prudens, of persons or things): fatuus (silly; from want of judgement): stolidus (from want of reasonable moderation; from brutality): demens (that has lost his mind; who acts senselessly): ineptus (without good sense): insulsus (absurd): mente captus: vesanus (insane, mad): ridiculus (amusing, like a fool): mirus (strange). A foolish affair or thing, mira res; mirum negotium: a foolish fellow (i. e., droll), ridiculum caput. I consider it very foolish to, etc., summae dementiae esse judico, with following infinitive.

Quick answer

What is the Latin word for foolish?
The usual Latin words for “foolish” are stultus, fatuus, stolidus; also dēmō, ineptus, īnsulsus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.