Synonyms for endless
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Having no end in space
infinite, measureless, interminable, indeterminable, untold, countless, without end, continuous, unending, unbounded, unlimited, immeasurable, unmeasured, limitless, unsurpassable, having no bounds, multitudinous, boundless, incalculable, illimitable, unfathomable.
Antonyms fixed*, finite, bounded.
Having no end in time
perpetual, everlasting, interminable, continual; see eternal 1, 2, unending.
See endless in Webster's New World Roget's A-Z Thesaurus II
adjective
Having no ends or limits:
boundless, illimitable, immeasurable, infinite, limitless, measureless, unbounded, unlimited. See limitedEnduring for all time:
amaranthine, ceaseless, eternal, everlasting, immortal, never-ending, perpetual, unending, world without end. (Archaic) eterne. See continueExisting or occurring without interruption or end:
around-the-clock, ceaseless, constant, continual, continuous, eternal, everlasting, incessant, interminable, nonstop, ongoing, perpetual, persistent, relentless, round-the-clock, timeless, unceasing, unending, unfailing, uninterrupted, unremitting. See continue
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