Incompetent
/ˌɪˈnkɑmpətənt/
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Definition
(adj) Lacking the degree of ability and responsibility necessary to do a task successfully.
Sentence Examples
The world is full of incompetent doctors.
He was fired for being an incompetent worker.
CEFR Practice Quiz
The contractor did such an ____ job on the house that we had to hire someone else to fix it.