LATIN DICTIONARYLexicon Latīnum
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“disastrous” in Latin

The English word disastrous itself goes back to Latin astrum.

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

disastrous
miser: calamitosus. (The words are found in this connection and order.) funestus et calamitosus: infelix: adversus: malus: luctuosus: gravis: tristis: infestus (SYN. in CALAMITOUS). A disastrous event, clades: calamitas. (The words are found in this connection and order.) clades atque calamitas: incommodum: malum: casus adversus or infestus: a most disastrous war, acerbissimum atque calamitosissimum bellum: a disastrous fire, calamitosum incendium. Disheartened by these disastrous battles, his proeliis calamitatibusque fractus. Disastrous times, tempora gravia, iniqua.

Quick answer

What is the Latin word for disastrous?
The usual Latin words for “disastrous” are miser, calamitōsus, īnfēlīx; also adversus, malus, lūctuōsus. 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.