'Immutable' definitions:

Definition of 'immutable'

From: WordNet
adjective
Not subject or susceptible to change or variation in form or quality or nature; "the view of that time was that all species were immutable, created by God" [syn: immutable, changeless] [ant: changeable, mutable]

Definition of 'Immutable'

From: GCIDE
  • Immutable \Im*mu"ta*ble\, a. [L. immutabilis; pref. im- not + mutabilis mutable. See Mutable.] Not mutable; not capable or susceptible of change; unchangeable; unalterable. [1913 Webster]
  • That by two immutable things, in which it was impossible for God to lie, we might have a strong consolation. --Heb. vi. 18. [1913 Webster]
  • Immutable, immortal, infinite, Eternal King. --Milton. -- {Im*mu"ta*ble*ness}, n. -- {Im*mu"ta*bly}, adv. [1913 Webster]

Synonyms of 'immutable'

From: Moby Thesaurus