Not legally competent; not of sound
mind; mentally ill, senile, or feebleminded.

Merriam-Webster Online Dictionary
incompetent (adjective)
1.
not legally qualified
2.
inadequate to or unsuitable for a particular purpose
3.
a) lacking the qualities needed for effective action
b) unable to function properly - incompetent heart valves
Merriam-Webster Online Thesaurus
incompetent (adjective)
lacking qualities (as knowledge, skill, or ability) required to do a job
SYNONYMS:
inapt, incapable, inept, inexpert, unable, unfit, unfitted, unqualified, unskilled, unskillful
RELATED WORDS:
ineffective, ineffectual, inefficient; amateurish, callow, dilettantish, green, inexperienced, raw, unprofessional; unequipped, unprepared, untrained; useless, worthless; disqualified, ineligible; wanting
NEAR ANTONYMS:
prepared, ready, trained; overqualified; accomplished, ace, adept, consummate, crack, experienced, practiced ( practised), seasoned, veteran, virtuoso; all-around ( all-round), protean, versatile
able, capable, competent, expert, fit, qualified, skilled, skillful, ultracompetent
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