Incompetent – अक्षम, अयोग्य

Noun – An incompetent person; a mentally deficient person.

Example – That incompetence covers the technical, political, cognitive and moral domains.

Synonyms – Ineffectual,, inefficient,, ineligible, inept, inexperienced,  inexpert, insufficient, maladroit, not cut out for, not equal to, not have it, out to lunch, raw, unadapted, unequipped, unfit, unfitted, unhandy, uninitiated, unproficient, unqualified, unskilled, untrained, useless.