mentally defective

mentally defective

adjective Referring to a person who has been determined by a court, board, commission or other lawful authority—as a result of marked subnormal intelligence, or mental illness, incompetency, condition or disease—as one who:
(1) Is a danger to him- or herself, or to others; or
(2) Lacks the mental capacity to contract or manage his or her own affairs.
noun
(1) A finding of insanity by a court in a criminal case;
(2) A person found to be incompetent to stand trial, or found not guilty, by reason of lack of mental responsibility pursuant to articles 50a and 72b of the Uniform Code of Military Justice, 10 U.S.C. 850a, 876b.

mentally defective

Sexual offenses adjective Referring to a person whose mental defect renders him/her temporarily or permanently incapable of appraising the nature of his/her own conduct. See Rape.