LATIN DICTIONARYLexicon Latīnum
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“immortal” in Latin

The English word immortal itself goes back to Latin mors, through immortālis.

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

immortal
immortalis (not subject to the law of death; also, IMPROP., of things; e.g., laus): aeternus: sempiternus [SYN. in ETERNAL]. To be immortal, immortalem or sempiternum esse: non interire (general term, not to die; e.g., of the soul): vita, sempiterna frui (to live for ever); memoria omnium seculorum vigere (to be fresh in the recollection of all ages; both of persons). Immortal glory, immortalis or sempiterna gloria: to render immortal or be rendered immortal. Vid: To IMMORTALIZE.

Quick answer

What is the Latin word for immortal?
The usual Latin words for “immortal” are immortālis, aeternus, sempiternus; also laus, vīta. 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.