Lacking qualities necessary for effective conduct or action.adjective
Inadequate for or unsuited to a particular purpose or application.adjective
Not functioning properly in the body.adjective
Not legally qualified, as testimony that does not meet the standards for admissibility or a juror whose personal interest in the outcome of the case does not allow him or her to serve.adjective
Lacking sufficient mental ability or awareness.noun
An incompetent person.noun
An incompetent person; one who is mentally or physically deficient.
Not competent; wanting ability or qualification; unable; incapable; inadequate.