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Definition of perpetual : Neverceasing; continuing forever or for an unlimited time; unfailing; everlasting; continuous.

Synonyms:

running, eonian, sempiternal, all the while, round-the-clock, pure, continued, thoroughgoing, complete, never-ceasing, regularly, hourly, changeless, aeonian, all the time, a lot, stark, around-the-clock, world without end, never-ending, at all times, frequent, common, consummate, eterne, immortal, uninterrupted, returning, often, arrant, gross, ongoing, always, repeatedly, intermittent, repeating, necessarily, invariably, imperishable, annual, double-dyed, short, constantly, unadulterated, perfect, continue, sodding, ageless, dateless, deathless, repetitious, staring, ever, frequently, unfailing, relentless, invariant, utter, amaranthine, transitory

incessant, straight, invariable, cyclical, level, unceasing, repetitive, unchanging, unremitting, un-intermittent, perennial, homogeneous, sequential, featureless, continuing, flat, unbroken, recurrent, repeated, robot-like, seamless, unending, continual, monotonous, indefatigable, habitual, steady, consecutive, coherent, connected, nonstop, consistent, unvarying, undying, uniform, regular, gapless, monolithic, continuous, undeviating, even

illimitable, infinite, interminable, ceaseless, incalculable, unlimited, numberless, countless, boundless, innumerable, unbounded, endless, immeasurable, bottomless, eternal, termless, limitless, timeless, inexhaustible, immemorial

everlasting, lasting, abiding, unchangeable, immutable, enduring, constant, persistent, fixed, permanent

long, lifetime, long-life, prolonged, lifelong, livelong, lengthy, durable

Usage examples:

• And now these never- to- be- forgotten words spoken over the grave of our old dog had come to awaken me from that beautiful dream of perpetual joy! - "Far Away and Long Ago", W. H. Hudson.
• It was a dull evening, for Wemmick drew his wine, when it came round, quite as a matter of business,- just as he might have drawn his salary when that came round,- and with his eyes on his chief, sat in a state of perpetual readiness for cross- examination. - "Great Expectations", Charles Dickens.
• We are to have perpetual motion. - "Modern American Prose Selections", Various.