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.

Wanting due strength or suitable faculties; unable.

Wanting the legal or constitutional qualifications. A person convicted of a crime, is an incompetent witness in a court of law or equity.

Destitute of means; unable.

Inadequate; insufficient; as incompetent testimony.

Unfit; improper; legally unavailable. It is incompetent for the defendant to make this defense.