What is the Latin word for rusty?

The usual Latin words for “rusty” are rōbīginōsus, aerūginōsus, difficilis; also mōrōsus, trīstis. The right choice depends on the sense; see the distinctions below.

English → Latin

“rusty” in Latin

rōbīginōsusrusty; rust-coloured aerūginōsusrusty, covered with copper rust difficilisdifficult, hard, troublesome; obstinate, intractable, hard to please or manage mōrōsuscaptious, persnickety, fastidious, difficult (to please); peevish, wayward, capricious trīstissad, unhappy, melancholy, morose; sorrowful, mournful; disagreeable, harsh, bitter (of taste)

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

rusty

PROP., rubiginosus (general term): aeruginosus (of brass and copper): rubigine obductus (covered with rust).

Figuratively, Morose, difficilis: natura difficilis: morosus. (The words are found in this connection and order.) difficilis et morosus: tristis.

Quick answer

What is the Latin word for rusty?: The usual Latin words for “rusty” are rōbīginōsus, aerūginōsus, difficilis; also mōrōsus, trīstis. 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.