- 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 on Thesaurus.com
Examples from the Web for insane
After all, what says Christmas more than obligations, gastrointestinal distress, and insane dining companions?The Top 10 Nontraditional Christmas TV Episodes
December 25, 2014
Yet she spoke of his dignity in such an insane situation and when she touched on his pain she expressed her own on his behalf.The Life and Hard Times Of The Family A Cuban Defector Left Behind
December 19, 2014
It's insane that you are losing friends in real life because of their ignorance on the Internet.The Unbearable Whiteness of Protesting
Rawiya Kameir, Judnick Mayard
December 10, 2014
“It's insane to see what the extreme version of that type of helpless anger combined with mental illness can create,” Cook wrote.School Shooters Love This Pickup Artist Website
December 5, 2014
Now we need to change the insane policies that lead to his killing.Eric Garner Was Choked to Death for Selling Loosies
December 3, 2014
Schwitter, the nurseryman, had proved to have a wife in an insane asylum.K
Mary Roberts Rinehart
The adoration of her, and the insane desire of her, can be seen in every play he wrote from 1597 to 1608.The Man Shakespeare
Advocated with more heat than light by the outmates of every asylum for the insane.The Devil's Dictionary
He, and he alone, in this insane city, will wait at table (the Chinaman doesn't count).American Notes
And the fancy was this: Are not the sane and the insane equal at night as the sane lie a dreaming?The Uncommercial Traveller
- 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 insane
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.