Existing or occurring without interruption or end:
around-the-clock, ceaseless, constant, continual, continuous, endless, eternal, everlasting, incessant, interminable, nonstop, ongoing, perpetual, persistent, relentless, round-the-clock, unceasing, unending, unfailing, uninterrupted, unremitting. See continueExisting unchanged forever:
ageless, dateless, eternal. (Archaic) eterne. See change
Learn more about timeless