incapable

Lacking the necessary ability, capacity, or power.

Unable to perform adequately; incompetent.

Not susceptible to action or treatment.

Not meeting the physical and mental requirements imposed by law for the performance of a particular task.

Not meeting the requirements necessary for proper legal functioning.

Not capable.

Lacking sufficient capacity or capaciousness; insufficient, unfit, or unqualified: in this and the succeeding uses commonly followed by of.

Not capable of receiving or admitting; not susceptible: as, his lot is incapable of amelioration.