unable

lacking qualities (as knowledge, skill, or ability) required to do a job a celebrated author of serious plays, he turned out to be a particularly unable writer of comedies Synonyms inapt, incapable, inept, inexpert, incompetent, unfit, unfitted, unqualified, unskilled, unskillfulRelated Words ineffective, ineffectual, inefficient; amateurish, callow, dilettantish, green, inexperienced, raw, unprofessional; unequipped, unprepared, untrained; useless, worthless; disqualified, ineligible; wantingNear Antonyms prepared, ready, trained; overqualified; accomplished, ace, adept, consummate, crack, experienced, practiced (also practised), seasoned, veteran, virtuoso; all-around (also all-round), protean, versatileAntonyms able, capable, competent, expert, fit, qualified, skilled, skillful, ultracompetent