in·com·pe·tent
/inˈkämpədənt/
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adjective
not having or showing the necessary skills to do something successfully.
"a forgetful and utterly incompetent assistant"
synonyms: inept, unskillful, unskilled, inexpert, amateurish, unprofessional, lacking ability, bungling, blundering, clumsy, unproficient, inadequate, substandard, inferior, ineffective, deficient, inefficient, ineffectual, no good, not good enough, wanting, lacking, leaving much to be desired;