36 synonyms for never ending such as constant, boundless, and ceaseless. Never ending is an adjective, and its antonyms are temporary and finite.
Boundless, ceaseless, constant, continual, continuous, countless, endless, eternal, everlasting, incessant, infinite, innumerable, interminable, limitless, measureless, myriad, non-stop, numberless, permanent, perpetual, persistent, relentless, steady, unbroken, unceasing, unending, unfaltering, uninterrupted, unlimited, unremitting, untold, without ceasing, without end, without interruption, and without number.