incompetent

adjective | \ in-ˈkäm-pə-tənt \ | in·com·pe·tent

1. a : lacking legal capacity (as because of age or mental deficiency)

   b : incapable due to mental or physical condition — compare competent

   c : lacking authority, power, or qualifications required by law an incompetent court incompetent evidence

2. : unable or failing to perform adequately fired for being incompetent an incompetent attorney — compare ineffective assistance of counsel

noun

1. : a person who is incompetent — compare interdict