Incompetency

1. The quality or state of being incompetent; lack of physical, intellectual, or moral ability; lack of qualifications or training (for a particular task); insufficiency; inadequacy; as, the incompetency of a child for hard labor, or of an idiot for intellectual efforts.
2. (Law) Lack of competency or legal fitness; incapacity; disqualification, as of a person to be heard as a witness, or to act as a juror, or of a judge to try a cause.