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im·mu·ta·ble

immutable

pronunciation:
ih myu t bl
part of speech: adjective
definition: not subject to change; unchanging or unchangeable.
The professor had an immutable habit of rubbing his hands together as he lectured.
synonyms:
abiding, changeless, constant, eternal, invariable, permanent, unchangeable
antonyms:
mutable, variable
similar words:
enduring, firm, fixed, immortal, indestructible, indissoluble, inevitable, inflexible, irreversible, perennial, perpetual, stable, stationary, steadfast
derivations: immutably (adv.), immutability (n.)