LATIN DICTIONARYLexicon Latīnum
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“decorous” in Latin

The English word decorous itself goes back to Latin decet, through decōrus.

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

decorous
Suitable, aptus; accommodatus alicui rei or ad aliquid: conveniens, consentaneus: to be decorous or suitable, aptum consentaneumque esse; convenire.
Becoming, quod decet aliquem (in general; ☞ never decens, except in poetry and in the Silver Age): decorus (only of words and actions).

Quick answer

What is the Latin word for decorous?
The usual Latin words for “decorous” are aptus, conveniō, cōnsentāneus; also decōrus. 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.