LATIN DICTIONARYLexicon Latīnum
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“calamitous” in Latin

The English word calamitous itself goes back to Latin calamitās, through calamitōsus.

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

calamitous
miser (pitiable, in bad circumstances): infelix (unfortunate): calamitosus (beset, oppressed with grief; beset with dangers, etc.): tristis (afflicting): luctuosus (doleful): gravis (heavy, distressing).
CALAMITOUS TIMES, gravia or iniqua.

Quick answer

What is the Latin word for calamitous?
The usual Latin words for “calamitous” are miser, īnfēlīx, calamitōsus; also trīstis, lūctuōsus, gravis. 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.