incompetent
🇺🇸
/ɪnˈkɑːmpɪtənt/
🇬🇧
/ɪnˈkɒmpɪtənt/
not having the necessary skills or knowledge to do a job or task properly
The new manager was considered incompetent in handling the crisis.
a person who lacks the necessary skills or knowledge to do a job or task properly
The company was filled with incompetents who couldn't get anything done.