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
continuous (part of speech: adjective)
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
infinite (part of speech: adjective)
illimitable, infinite, interminable, ceaseless, incalculable, unlimited, numberless, countless, boundless, innumerable, unbounded, endless, immeasurable, bottomless, eternal, termless, limitless, timeless, inexhaustible, immemorial
permanent (part of speech: adjective)
durable (part of speech: adjective)
- 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.