in·ca·pa·ble 
(ĭn-kāpə-bəl)
(ĭn-kāpə-bəl)adj.
1.
a. Lacking the necessary ability, capacity, or power: incapable of carrying a tune; incapable of love.
b. Unable to perform adequately; incompetent: an incapable administrator.
2. Not susceptible to action or treatment: a unique feat, incapable of duplication.
3. Law
a. Not meeting the physical and mental requirements imposed by law for the performance of a particular task.
b. Not meeting the requirements necessary for proper legal functioning: a contract provision incapable of being enforced.
in·ca′pa·bili·ty, in·capa·ble·ness n.
in·capa·bly adv.