Synonyms of perpetual

2 Syllables

diurnal, running, undying, long-term, all-time, constant, endless, deeping, lasting, longterm, standing, frequent, termless

3 Syllables

enduring, ceaseless, habitual, unfailing, cursive, immortal, repeated, extending, incessant, unceasing, continuous, perennial, unchanging, longstanding, timeless, continual, addicting, unending, persistent, returning, bulldogged, unchanged, reoccurring, repeating, changeless, continued, unended, eternal, round-the-clock, aeonian, unwaning, day-and-night, recurring, unbroken, recurrent, perduring, unfading, abiding, permanent

4 Syllables

unrelenting, sempiternal, protractile, unremitting, undestroyable, repetitious, immutable, invariable, monophonic, never-ending, unaltered, around-the-clock, undefined, oft-repeated, monochrome, intermittent, measureless, all-embracing, everlasting, infinite, never-ceasing, phoenixlike, perdurable, unbribable

5 Syllables

irrefrangible, self-perpetuating, amaranthine, supertemporal, undiversified, unmodifiable, reduplicating, nonperishable, irrefragable, incorruptible, uninterrupted, interminate, illimitable, interminable, imperishable, indestructible

6 Syllables

inexterminable, inextinguishable