adjective
- not mutable; unchangeable; changeless.
adjective
- unchanging through time; unalterable; agelessimmutable laws
early 15c., from Old French immutable and directly from Latin immutabilis “unchangeable,” from assimilated form of in- “not, opposite of” (see in- (1)) + mutabilis “changeable,” from mutare “to change” (see mutable). Related: Immutably.