Oxford Dictionary
unskilful
unskilful |ʌnˈskɪlfʊl, -f (ə )l |(also chiefly US unskillful ) ▶adjective not having or showing skill. DERIVATIVES unskilfully adverb, unskilfulness noun
Oxford Thesaurus
unskilful
unskilful adjective the furniture had been repaired by an unskilful hand: inexpert, incompetent, inept, unskilled, clumsy, awkward, maladroit, unhandy, amateur, amateurish, unprofessional, inexperienced, untrained, unpractised, crude, rude, unsophisticated, gauche, fumbling, bungling, blundering, botching; informal ham-fisted, ham-handed, cack-handed, cowboy, not up to scratch. ANTONYMS skilful.