LATIN DICTIONARYLexicon Latīnum
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“deleterious” in Latin

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

deleterious
perniciosus; exitiosus; exitialis (the first of an injurious; the two next, of a destructive nature): nocens, noxius, nociturus (hurtful; deleterious substances, ea, quae nocitura videntur): veneno imbutus, or infectus, or tinctus. tabidus: tabificus (e.g., venenum, etc., causing substances to waste away, etc.): virulentus (imbued with poison; or of a poisonous nature): who does not know that this substance is of a deleterious nature? quis non intelligit hanc rem nocere? to be deleterious, nocere; nociturum esse.

Quick answer

What is the Latin word for deleterious?
The usual Latin words for “deleterious” are perniciōsus, exitiōsus, exitiālis; also noceō, noxius, īnficiō. 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.