Incompetent
INCOM'PETENT, adjective [Latin in and competens, competo. See Incompatible.]
1. Wanting adequate powers of mind or suitable faculties; as an incompetent judge. Infancy, derangement, want of learning or dotage may render a person incompetent to fill an office or to transact business.
2. Wanting due strength or suitable faculties; unable.
3. Wanting the legal or constitutional qualifications. A person convicted of a crime, is an incompetent witness in a court of law or equity.
4. Destitute of means; unable.
5. Inadequate; insufficient; as incompetent testimony.
6. Unfit; improper; legally unavailable.
It is incompetent for the defendant to make this defense.