The definition of stable is something steady that is not prone to change, someone who is level headed and who isn't subject to wild swings of emotion.
Not subject to change or variation; unchanging:
Capable of or subject to change or alteration.
Variable is defined as something inconsistent or able to change.
Blooming continuously throughout the growing season
The definition of permanent is someone or something that is supposed to last for a very long time.
Lasting; continuing; durable:
(Dated) Exceedingly great or bad; used as an intensifier.
(Commerce) Not rising or falling very much; steady
Not variable; not changing; constant; uniform
(Informal) Having a firmly favorable or good relationship
Having or showing no doubt; positive; confident
Capable of being changed or adjusted to meet particular or varied needs:
That cannot be altered; unchangeable
Refusing to change one's attitude, purpose, or principles; immovable:
Not to be altered; immutable:
Varying in color or appearance when seen from different angles:
Not flexible or pliant; stiff:
Find another word for immutable. In this page you can discover 27 synonyms, antonyms, idiomatic expressions, and related words for immutable, like: changeless, stable, fixed, mutable, variable, perpetual, permanent, constant, enduring, eternal and firm.