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“pestilent, pestilential” in Latin

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

pestilent, pestilential
pestilens (PROP.); foedus (figuratively); ☞ pestilentiosus only in late writers: a disease is pestilential, pestilentia in morbos perniciales evadit (Liv., 27, 23): a pestilential atmosphere, aer pestilens (opposed to aer salubris): ☞ aer pestifer is unclassical.

Quick answer

What is the Latin word for pestilent, pestilential?
The usual Latin words for “pestilent, pestilential” are pestilēns, 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.