<p><strong>Adjective</strong></p><ul><li>not competent; lacking qualification or ability; incapable: an incompetent candidate.</li><li>characterized by or showing incompetence: His incompetent acting ruined the play.</li><li>being unable or legally unqualified to perform specified acts or to be held legally responsible for such acts.</li></ul><p><strong>Noun</strong></p><ul><li>an incompetent person; a mentally deficient person.</li><li>a person lacking power to act with legal effectiveness.</li></ul>