adj. 25B6; adjective UNALTERABLE, immutable, invariable, changeless, fixed, hard and fast, cast-iron, set in stone, established, permanent, enduring, abiding, lasting, indestructible, ineradicable, irreversible.
variable.
UNCHANGEABLE
Meaning of UNCHANGEABLE in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012