Im‐mu″ta‐ble (?), a. [L. immutabilis; pref. im- not + mutabilis mutable. See Mutable.] Not mutable; not capable or susceptible of change; unchangeable; unalterable.
That by two immutable things, in which it was impossible for God to lie, we might have a strong consolation. Heb. vi. 18.
Immutable, immortal, infinite,
Eternal King. Milton.
— Im‐mu″ta‐ble‐ness, n. — Im‐mu″ta‐bly, adv.