Also found in: Dictionary, Thesaurus, Medical, Idioms, Encyclopedia, Wikipedia.
Related to Insane: Instagram

INSANE. One deprived of the use of reason, after he has arrived at the age when he ought to have it, either by a natural defect or by accident. Domat, Lois Civ. Lib. prel. tit. 2, s. 1, n. 11.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in classic literature ?
He looked up at the two perched high above him, his red-rimmed eyes blazing with insane hatred, and then he wound his trunk about the bole of the tree, spread his giant feet wide apart and tugged to uproot the jungle giant.
If she were insane they would observe it in her letters."
On the other hand, he possibly spent more money in relieving hard-luck cases than did the wildest of the new millionaires on insane debauchery.
I very much questioned within myself, as I walked through the Insane Asylum, whether I should have known the attendants from the patients, but for the few words which passed between the former, and the Doctor, in reference to the persons under their charge.
A BMW driver who killed teenager Katelyn Dawson WAS driving dangerously but was not criminally responsible for her death due to 'insane automatism',' the CPS has said in the letter to the victims.
ISLAMABAD -- Federal Minister for Science and Technology Fawad Chaudhry said on Monday insistence on the government's subsidising media houses and media businesses is 'insane.'
NEW Liverpool restaurant Frost Burgers has closed until further notice following 'insane' floods over the weekend.
That's right, officials were concerned that the President was so much of a threat to national security they were going to try to declare him unable to discharge his duties - either through being a traitor or being insane.
President Rodrigo Duterte warned of more terroristic attacks by the Islamic State of Iraq and Syria (ISIS), which he described as 'insane' and 'made in hell.'
Tesla CEO Elon Musk has defended the layoffs at his private rocket company SpaceX as salvaging "two insane projects" via cost reduction.
Currently, the negative attitude of Indian Foreign Ministry and insane comments of Army Chief Bipin Rawat are questioning.