incompetent

US /ɪnˈkɑ:mpɪtənt/

UK /ɪnˈkɒmpɪtənt/

B2
adj.AdjectiveNot having the skill or ability to do a thing well
He was fired from the position because he was an incompetent worker
n.NounPerson who is completely unable to do something
For remembering names, the new guy is an incompetent

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