INCOMPETENT a. 3 definitions
Not competent; wanting in adequate strength, power, capacity, means, qualifications, or the like; incapable; unable; inadequate; unfit. Incompetent to perform the duties of the place. Macaulay.
DISABILITY n.
State of being disabled; deprivation or want of ability; absence of competent physical, intellectual, or moral power, means, fitness, and the like. Grossest faults, or disabilities to perform what was covenanted. Milton. Chatham refused to see him, pleading his disability. Bancroft.