LATIN DICTIONARYLexicon Latīnum
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“mortal” in Latin

The English word mortal itself goes back to Latin mors, through mortālis.

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

mortal
Subject to death, mortalis; morti obnoxius: mortals, homines, mortales (☞ m the best prose only in connection with omnes, cuncti, multi not for homines, general term).
Deadly, destructive, mortifer (☞ letalis or letifer, poetical).
Extreme (a vulgar acceptation of the word); by superlatives: a mortal enemy, hostis capitalis, infensissimus, implacabilis.
Human, humanus.

Quick answer

What is the Latin word for mortal?
The usual Latin words for “mortal” are mortālis, mortifer, hūmānus; also homō̆, cūnctus, lētifer. 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.