unrelenting

1 sticking to an opinion, purpose, or course of action in spite of reason, arguments, or persuasion that professor tends to be unrelenting about deadlines Synonyms adamant, adamantine, bullheaded, dogged, hard, hardened, hardheaded, hard-nosed, headstrong, immovable, implacable, inconvincible, inflexible, intransigent, mulish, obdurate, opinionated, ossified, pat, pertinacious, perverse, pigheaded, self-opinionated, self-willed, stiff-necked, stubborn, unbending, uncompromising, obstinate, unyielding, willful (or wilful)Related Words anal-retentive, obsessive; wayward, wrongheaded; determined, hell-bent, inexorable, persistent, relentless, resolved, set, single-minded, steadfast, stouthearted, tenacious, unflinching; firm, hard-line, hard-shell (or hard-shelled), iron, severe, stern, strict; hidebound, narrow-minded, rigid; bloody-minded [chiefly British], cantankerous; contrary, cussed; contumacious, disobedient, froward, insubordinate, intractable, recalcitrant, refractory, uncooperative, ungovernable, unmanageable, unruly; defiant, insurgent, mutinous; indomitable, invincible, unconquerable; confirmed, inveterate, unregenerate; demanding, exactingNear Antonyms docile, obedient, placable, submissive, tractable; accepting, persuadable, receptive, responsive, willing; governable, manageable, reasonable, temperate; slavish, subservientAntonyms acquiescent, agreeable, amenable, compliant, complying, flexible, pliable, pliant, relenting, yielding

2 showing no signs of slackening or yielding in one's purpose unrelenting in the pursuit of equality for all races Synonyms determined, dogged, grim, implacable, relentless, unappeasable, unflinching, unyieldingRelated Words persevering, persistent, tenacious; hard, hardheaded, headstrong, intractable, mulish, obdurate, opinionated, peevish, pertinacious, perverse, pigheaded, self-willed, stubborn, uncooperative, willful (or wilful); merciless, ruthless, unforgivingNear Antonyms slackening, softening, yielding; impotent, invertebrate, slack, spineless, weak; complaisant, obliging, pliable, pliant