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“pernicious” in Latin

The English word pernicious itself goes back to Latin per, through perniciōsus.

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

pernicious
perniciosus (Cic.); pernicialis (Liv., Plin.); exitiosus, exitialis; noxius (Cic.; noxiosus Sen.); damnosus; detrimentosus; nocivus (Plin.).

Quick answer

What is the Latin word for pernicious?
The usual Latin words for “pernicious” are perniciōsus, pernĭcĭālis, exitiōsus; also exitiālis, noxius, damnōsus. 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.