Synonyms of immutable

2 Syllables

steely, steadfast, stablest, steelier, diurnal, brick-wall, fixed, stabler, termless, stable, constant

3 Syllables

enduring, ruffianly, sacrosanct, perpetual, eternal, unchanging, uniform, changeless, unfading, perduring, abiding, permanent, stabile, ageless, hard-shelled

4 Syllables

immovable, invariable, monophonic, resolute, unchangeable, monochrome, sempiternal, inflexible

5 Syllables

irrefragable, unalterable, inalterable, irrefrangible, unadaptable, nonperishable, irreversible, indestructible, unmodifiable, undiversified, unrepealable, unreversible, irrevocable

6 Syllables

inexterminable