See ceaseless in Webster's New World Roget's A-Z Thesaurus II
adjective
Existing or occurring without interruption or end:
around-the-clock, constant, continual, continuous, endless, eternal, everlasting, incessant, interminable, nonstop, ongoing, perpetual, persistent, relentless, round-the-clock, timeless, unceasing, unending, unfailing, uninterrupted, unremitting. See continueEnduring for all time:
amaranthine, endless, eternal, everlasting, immortal, never-ending, perpetual, unending, world without end. (Archaic) eterne. See continue
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