LATIN DICTIONARYLexicon Latīnum
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“unnatural” in Latin

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

unnatural
parum naturalis: quod praeter naturam exsistit (which is against nature): monstrosus (contrary to nature, with reference to size, bulk, shape, or whether physical or moral existence): portentosus (terrific, exciting fear, horror, etc., by its unnatural appearance): immanis (huge, relating to unusual shape, size, bulk, force, causing amazement or fear, whether from its physical or moral qualities): ascitus (borrowed or taken from others, not natural, but affected; opposed to nativus). Unnatural desires, cupiditates, quae ne naturam quidem attingunt; libidines monstrosae (unnatural lusts): an unnatural son, rconstrum filii.

Quick answer

What is the Latin word for unnatural?
The usual Latin words for “unnatural” are mōnstruōsus, portentōsus, immānis; also ascīscō, cupiditās. 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.