Webster 1913 Edition
Not competent; wanting in adequate strength, power, capacity, means, qualifications, or the like; incapable; unable; inadequate; unfit.
Incompetentto perform the duties of the place.
Richard III. had a resolution, out of hatred to his brethren, to disable their issues, upon false and
incompetentpretexts, the one of attainder, the other of illegitimation.
Syn. – Incapable; unable; inadequate; insufficient; inefficient; disqualified; unfit; improper.
Incapable. Incompetent is a relative term, denoting a lack of the requisite qualifications for performing a given act, service, etc.; incapable is absolute in its meaning, denoting lack of power, either natural or moral. We speak of a man as incompetent to a certain task, of an incompetent judge, etc. We say of an idiot that he is incapable of learning to read; and of a man distinguished for his honor, that he is incapable of a mean action.
Webster 1828 Edition
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.