lunatic

lunatic adjective absurd, bereft of reason, crazed, crazy, daft, dementate, demented, deranged, disordered, foolish, frenetic, frenzied, insane, insensate, irrational, mad, maniacal, manic, mentally aberrant, mentally ill, mentally unbalanced, nonsensical, obsessed, of unsound mind, out of one's mind, out of one's senses, possessed, raging, raving, reasonless, senseless, touched, unhinged, wandering, wild

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See also: non compos mentis

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LUNATIC, persons. One who has had an understanding, but who, by disease, grief, or other accident, has lost the use of his reason. A lunatic is properly one who has had lucid intervals, sometimes enjoying his senses, and sometimes not. 4 Co. 123; 1 Bl. Com. 304; Bac. Abr. Idiots, &c., A; 1 Russ. on Crimes, 8; Shelf. on Lun. 4; Merlin, mot Demence; Fonb. Eq. Index, h.t.; 15 Vin. Ab. 131; 8 Com. Dig. 721; 1 Supp. to Ves. jr. 94, 130, 369, 404; 2 Supp. to Ves. jr. 51, 106, 151, 360; 1 Vern. 9, 137, 262; Louis. Code, tit. 9, c. 1; and articles Lucid Interval; Lunacy.