in·com·pe·tence 
/ɪnˈkɑ:mpətəns/ noun
/ɪnˈkɑ:mpətəns/ noun [noncount] : lack of the ability to do something well : the quality or state of not being competent
▪ mental incompetence ▪ Because of his incompetence, we won't make our deadline. ▪ She was fired for gross incompetence. — opposite competence
▪ mental incompetence ▪ Because of his incompetence, we won't make our deadline. ▪ She was fired for gross incompetence. — opposite competence
