LATIN DICTIONARYLexicon Latīnum
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“coarse” in Latin

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

coarse
not fine or tender, crassus (the proper word): densus (thick, with parts closely pressed together): coarse flour, *farina crassa: coarse bread, panis secundarius or secundus: coarse food, victus asper: coarse sand, sabulo: saburra (as ballast): a coarse toga, toga crassa: coarse thread, filum crassum.
Rough, unpolished, inhumanus: inurbanus: agrestis: rusticus |SYN. in BOOR]. (The words are found in this connection and order). ferus agrestisque. A coarse joke, jocus illiberalis: jocus invidiosus (that makes us enemies): coarse manners, mores inculti: rusticitas (coarseness of behavior): a coarse brute, merum rus. To use coarse language against anybody, aspere or contumeliose (the latter meaning in an insulting manner) invehi in aliquem; probris et maledictis vexare aliquem: coarse-minded, horridus; horridus et durus: asperi animi (or by the words given above, inhumanus, etc., which relate more to the want of outward polish than to what it really wroug.
Common, ordinary, vulgaris: or by substantive, vulgus, with the genitive, “coarse pracitioners” (Arbuth.).*vulgus medicorum (after Cic., vulgus patronorum. etc.).
Not made neatly or skillfully, non artificiosus: inconditus: infabre factus: inscitus.

Quick answer

What is the Latin word for coarse?
The usual Latin words for “coarse” are crassus, dēnsus, inhūmānus; also inurbānus, agrestis, rūsticus. 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.