single–minded

fully committed to achieving a goal every successful reform movement has been spearheaded by a single-minded activist who refused to accept defeat Synonyms bent (on or upon), bound, decisive, do-or-die, firm, hell-bent (on or upon), intent, out, purposeful, resolute, resolved, set, single-mindedRelated Words bitter, vehement; certain, cocksure, confident, positive, sure; earnest, serious; steady, unfaltering, unhesitating, unswerving, unwavering; adamant, adamantine, dogged, hard, hardened, hardheaded, headstrong, immovable, implacable, inflexible, mulish, obdurate, persistent, pertinacious, perverse, pigheaded, rigid, self-willed, stubborn, tenacious, unbending, uncompromising, unrelenting, unyielding, willful (or wilful)Near Antonyms distrustful, doubtful, dubious, mistrustful, skeptical, suspicious, uncertain, unconvinced, undecided, unsettled, unsure; disinclined, indisposed, loath (also loth or loathe), reluctantAntonyms faltering, hesitant, indecisive, irresolute, undetermined, unresolved, vacillating, wavering, weak-kneed