istidat
aptitude. natural readiness. quickness. capacity to learn. skill. talent. capacity to yield to some influence or action. capability. disposition. dowry. fitness. genius. gift. instinct. intelligence. predispostion. tendency. vocation.

istidatlı
talented. promising. capable. apt. gifted. predisposed.

istidatsız
having no talent. unpromising. incapable. incompetent. inept.