LATIN DICTIONARYLexicon Latīnum
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“whim” in Latin

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

whim
celer motus ingenii: impulsio: commentum (an invention): libido. As one’s whim is, ad libidinem alicujus: a foolish whim, ineptum; absurdum consilium: according to one’s whim and fancy, ad animi sui arbitrium ac libidinem (after Cic.).

Quick answer

What is the Latin word for whim?
The usual Latin words for “whim” are impulsiō, comminīscor, libīdō; also ineptus. 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.