adj. 25B6; adjective RELENTLESS, unrelenting, continual, constant, continuous, unabating, unrelieved, sustained, unceasing, ceaseless, endless, unending, persistent, perpetual, interminable.
UNREMITTING
Meaning of UNREMITTING in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012