not changing or not susceptible to change; immutable.

not subject to decay, destruction or change; immutable; imperishable.

(gram.) an indeclinable particle i.e. a) a short, usually uninflected and invariable part of speech used to express a syntactic or semantic relationship, as an article or any of certain prepositions, conjunctions or interjections b) a prefix or derivational suffix.

(phil.) a permanent state or condition; the state of becoming one with the Supreme; the final beatitude.

(phil.) the immutable Supreme.