nesposoban

1. (of a person) incompetent; incapable
   Novi direktor je potpuno nesposoban. — The new director is completely incompetent.
2. (+ za + acc. or da) unable; unfit
   Posle povrede bio je nesposoban za rad. — After the injury he was unfit for work.
   Bila je nesposobna da izgovori ijednu reč. — She was unable to say a single word.

Used with za + accusative (nesposoban za rad) or da + present (nesposoban da shvati).