Englishunceasing
adjective
the unceasing efforts of the staff:
incessant, ceaseless, unending, endless, never-ending, interminable, non-stop, constant, continuous, continual, uninterrupted, unabated, unabating, unremitting, relentless, unrelenting, unrelieved, sustained, persistent, lasting, eternal, perpetual;
unfaltering, unflagging, untiring, unwearied, unwavering, unswerving, undeviating, persevering, dogged, tireless, indefatigable.
▷antonyms intermittent, occasional; half-hearted.
unceasing Oxford Dictionary of English