LATIN DICTIONARYLexicon Latīnum
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“rude” in Latin

The English word rude itself goes back to Latin rudis.

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

rude
rudis (inexperienced; e.g., as an artisan): incultus, agrestis (unmaeinerly): ferus, immansuetus (not tame, wild). (The words are found in this connection and order.) ferus agrestisque (clownish): asper (rough, harsh): inurbanus (not polite). Rude manners, mores agrestes or feri.

Quick answer

What is the Latin word for rude?
The usual Latin words for “rude” are rudis, incultus, agrestis; also ferus, immānsuētus, asper. 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.