unflinching

showing no signs of slackening or yielding in one's purpose he was unflinching in his determination to see that justice was done Synonyms determined, dogged, grim, implacable, relentless, unappeasable, unyielding, unrelentingRelated 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