LATIN DICTIONARYLexicon Latīnum
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“dreadful” in Latin

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

dreadful
terribilis (causing fright; terrificus is poetical only): horribilis: horrendus (causing horrour): atrox (fearful, frightful; e.g., death, bloodshed): immanis (monstrous, quite unnatural, cruel; e.g., animal, deed, character): foedus (causing indignation, abominable; e.g., projects, war, fire, or conflagration): dirus (dire): trux (causing men to shudder; e.g., of looks): incredibilis (that can’t be conceived, e.g., stupidity, stupiditas): to be the bearer of some dreadful news, miros terrores afferre ad aliquem.

Quick answer

What is the Latin word for dreadful?
The usual Latin words for “dreadful” are terribilis, horribilis, horrendus; also atrōx, immānis, foedus. 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.