LATIN DICTIONARYLexicon Latīnum
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“ennui” in Latin

The English word ennui itself goes back to Latin odium, through inodiō.

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

ennui
temporis molestia (general term, Ov., Met., 8, 652): otii molestia (from want of employment; after the same passage); also, molestia only, with genitive (e.g., molestia paucorum dierum). Also, taedium with genitive of what causes the ennui, or molestia, quam (or taedium, quod) aliquid mihi affert. To suffer ennui, *tempus tarde labens moleste ferre; otio languescere: to suffer ennui from anything, taedium cepi alicujus rei; aliquid taedium mihi affert: to complain of ennui, queror nihil me habere, quod agam: to be dying of ennui, otio tabescere: to banish ennui by anything, horas, or tempus, or tempora tarde labentia fallere aliqua re (e.g., sermonibus, narrando, ☞ Ov., Met., 8, 652; Trist., 3, 2, 12: ☞ otium fallere would be quite wrong, otium meaning only the being without employment): to cause ennui to anybody, molestiam alicui afferre or exhibere.

Quick answer

What is the Latin word for ennui?
The usual Latin words for “ennui” are molestia, quī. 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.