LATIN DICTIONARYLexicon Latīnum
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“inauspicious” in Latin

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

inauspicious
infaustus (e.g., nomen, not lucky, and therefore causing ill-luck to be anticipated). (The words are found in this connection and order.) infaustus et infelix: ☞ inauspicatus is post-Augustan in this sense; nomen, Plin.: ominosus (containing an omen, especially of bad luck, post-Augustan; res, Plin., Ep., 3, 14, fin.): funestus (causing grief, etc.): sinister (happening on the left hand; hence of unfavorable omen, †, and post-Augustan, prose): adversus (opposed to one’s wishes).

Quick answer

What is the Latin word for inauspicious?
The usual Latin words for “inauspicious” are īnfaustus, nōmen, ōminōsus; also fūnestus, sinister, adversus. 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.