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unchangeable
adjective
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How to pronounce unchangeable:

Definition of unchangeable:

unchangeable (adjective):
not able to be altered
not changing or to be changed immutable
adjective. not changeable or subject to change.

Synonyms for unchangeable:

lastingunalterableestablishedpermanentfrozenstableimmovablefixedinvariablesteady
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Antonyms for unchangeable:

transientversatileaccommodatingvariedhesitantliberalunlikeficklecomplaisantmerciful
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Other 4-syllable words like unchangeable

Here are some other common words that have 4 syllables, like unchangeable does.

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