Synonyms of incompetent

1 Syllable

raw

2 Syllables

awkward, muddler, fumbler, duffer, bungling, klutzy, feebler, uncool, fumblers, feeblest, bumblers, inept, junker, bumbler, bungler, lightweight, clumsy, muddlers, clumsier, strengthless, feckless, shiftless, helpless, unfit, bunglers, duffers, scrapper

3 Syllables

untrained, floundering, nonexpert, unhandy, bush-league, ham-handed, ill-shaped, addlebrain, featherbrain, unable, amateur, impotent, unskilled, forceless, useless, slack-spined, inexpert, niggardly, maladroit, impuissant, unfitted

4 Syllables

directionless, unusable, untalented, mismanager, unfunctional, unusuable, disqualified, inproficient, unequipped, improficient, nonperformer, nonfunctional, defeasible, inutile, unambitious, unqualified, unproficient, unadapted, insufficient, ne'er-do-well, ineffectual, amateurish, incapable, inefficient

5 Syllables

inadmissible, unworkmanlike, inexperienced, unaccustomed, invertebrate, unprofessional, ineligible, unallowable, underachiever, anticlimactic, uninitiated, underachievers, inadequate, ineffective, inefficacious