noun
a person who is not competent or qualified to do a particular task or job
adjective
not having or showing the necessary skills to do something successfully
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The board decided to remove the incompetent manager from his position.
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I can't believe they hired such an incompetent person for the job.
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That guy is totally incompetent, he has no idea what he's doing.
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Her lack of preparation made her seem incompetent in the eyes of her colleagues.