That cannot change or be changed; not liable to change; immutable, invariable.

figurative. Not subject to change; unalterable, fixed. immovable feast: a religious feast celebrated on the same date every year, such as Christmas…

Not subject to change; unalterable; = immovable, adj. 2a.

Not mutable; not subject to or susceptible of change; unchangeable, unalterable, changeless.

(un-, prefix1 affix 1b.)

Incapable of declining, or being caused to decline; undeviating, unchangeable, fixed, constant.

Immutable.

Not changeable; not liable to change or alteration; unchangeable, immutable.

That cannot be revoked, repealed, annulled, or undone; unalterable, irreversible. (The prevailing sense.)

Not liable to change; incapable of being changed; constant.

That cannot be recalled or revoked; irrevocable. Obsolete.

Not alterable; not subject to alteration or change; unchangeable, immutable; unalterable.

Incapable of being altered; immutable.

Not changeable; unchangeable, immutable.

The act or possibility of revoking, undoing, or annulling something done or past. Chiefly in beyond (also past, without) recall.

That cannot be interfered with or altered in any way; fixed, unchangeable. Obsolete.

Not subject to variation or alteration; unchangeable, unalterable; remaining ever the same, unchanging, constant; occurring alike in every case…

That cannot be altered or changed. In general use.

That cannot be recalled; (originally) spec. = irrevocable, adj. 2.

(un-, prefix1 affix 1b.)

Irreversible.

That cannot turn or change; immutable.

That cannot be undone, repealed, or annulled; unalterable, irrevocable.

That cannot be brought to a desired form, state, condition, etc. Const. †into, to.

Incapable of being changed into anything else; †spec. incapable of being assimilated, indigestible (cf. convertible, adj. 5b).

Of truths, principles, divine or natural laws, etc.: Valid through all eternity, immutable, unalterable. Esp. in eternal truthsor verities, necessary…

Not transmutable; that cannot be transmuted into something else; unchangeable.

Incapable of conversion (in various senses); inconvertible.

Irreversible.

Not modifiable.

Incapable of revision or alteration.

Irreversible, unalterable.

figurative. That admits of no release or change of state; absolute, fixed, hopeless.

Of a breed of animal or variety of plant: producing offspring whose traits vary little from those characteristic of the breed or variety, or…

Not fluxible; not liable to flux or change.

That cannot or must not be revised.

Not transformable; incapable of transformation.