incompetent

someone who is not competent to take effective action

not qualified or suited for a purpose

• “an incompetent secret service”
• “the filming was hopeless incompetent”

showing lack of skill or aptitude

• “a bungling workman”
• “did a clumsy job”
• “his fumbling attempt to put up a shelf”

not doing a good job

• “incompetent at chess”

not meeting requirements

• “unequal to the demands put upon him”