RELENTLESS

adj. 1 unyielding, inexorable, unstoppable, unrelenting, dogged, implacable, inflexible, unbending, unmoving, unmoved, unrelieved, stiff, hard, stiff-necked, rigid, obstinate, adamant, obdurate, intransigent, determined, unswerving, undeviating, intractable, persevering, steely, tough, intransigent, unsparing, uncompromising, pitiless, unforgiving, ruthless, merciless, cruel, unmerciful, remorseless The novel is about the relentless horde of Mongols that swept across Europe in the 13th century 2 non-stop, persistent, incessant, unrelenting, unremitting, unstoppable, perpetual, unfaltering, unfailing, unflagging, unrelieved, unabated, unrelieved, unbroken, continual, continuous, ceaseless, constant, unceasing, steady, habitual, regular: Won't you ever stop your relentless nagging?