determined

Synonyms

bent (on or upon), bound, decisive, do-or-die, firm, hell-bent (on or upon), intent, out, purposeful, resolute, resolved, set, single-minded;

Antonyms

faltering, hesitant, indecisive, irresolute, undetermined, unresolved, vacillating, wavering, weak-kneed;

Near Antonyms

distrustful, doubtful, dubious, mistrustful, skeptical, suspicious, uncertain, unconvinced, undecided, unsettled, unsure;

disinclined, indisposed, loath (also loth), reluctant;

Related 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);

Phrases

on one's mettle;