LATIN DICTIONARYLexicon Latīnum
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“unchangeable” in Latin

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

unchangeable
immutabilis (immutable): constans (remaining the same, constaeit): stabilis (standing firm): ratus (fixed, unalterable; e.g., cursus lunae; astrorum ordines): perpetuus (lasting uninterruptedly; e.g., right, jus). God is unchangeable, *in Deum mutatio non cadit.

Quick answer

What is the Latin word for unchangeable?
The usual Latin words for “unchangeable” are immūtābilis, cōnstō, stabilis; also reor, perpetuus, iūs. 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.