- not sane; not of sound mind; mentally deranged.
- of, relating to, or characteristic of a person who is mentally deranged: insane actions; an insane asylum.
- utterly senseless: an insane plan.
Origin of insane
SynonymsSee more synonyms for insane on Thesaurus.com
Examples from the Web for insaner
I mean him no discourtesy, and I am not charging—nor even imagining—that he is insaner than the rest of the human race.The Man That Corrupted Hadleyburg and Other Stories
Mark Twain (Samuel Clemens)
An instant later there was a mad tugging at the front door bell, and an insaner clatter at the knocker.VC -- A Chronicle of Castle Barfield and of the Crimea
David Christie Murray
It is doubtful that an insaner plan of campaign than this was ever devised by any man in command of a great army.The History of the Confederate War, Its Causes and Its Conduct, Volume II (of 2)
George Cary Eggleston
- mentally deranged; crazy; of unsound mind
- (as collective noun; preceded by the)the insane
- characteristic of a person of unsound mindan insane stare
- irresponsible; very foolish; stupid
Word Origin and History for insaner
1550s, from Latin insanus "mad, insane; outrageous, excessive, extravagant," from in- "not" (see in- (1)) + sanus "well, healthy, sane" (see sane). Originally only of persons; of actions, from 1842. Cf. lunatic; and Italian pazzo "insane," originally a euphemism, from Latin patiens "suffering." German verrückt, literally past participle of verrücken "to displace," "applied to the brain as to a clock that is 'out of order' " [Buck]. The noun meaning "insane person" is attested from 1786.
- Of, exhibiting, or afflicted with insanity.