unchangeable (adjective) unchangeable: constant, steadfast
Sinonime: changeless,
continuing,
firm,
fixed, immovable,
immutable, inalterable,
inevitable,
inflexible, invariable, irreversible,
permanent,
resolute,
stable,
strong, unalterable, unmodifiable, unmovable
Antonime: changeable,
changing, inconstant,
intermittent,
temporary