Also found in: Thesaurus, Medical, Legal, Idioms, Encyclopedia, Wikipedia.
Related to loony: looney, loony bin


or loon·ey also lun·y (lo͞o′nē)Informal
adj. loon·i·er, loon·i·est also lun·i·er or lun·i·est
1. Extremely foolish or silly.
2. Mentally deranged; crazy.
n. pl. loon·ies or loon·eys also lun·ies
A foolish or crazy person.

[Shortening and alteration of lunatic, or from loon.]

loon′i·ly adv.
loon′i·ness n.


(ˈluːnɪ) ,




adj, loonier, looniest, lunier or luniest
1. lunatic; insane
2. foolish or ridiculous
n, pl loonies, looneys or lunies
a foolish or insane person
ˈlooniness, ˈluniness n


or loon•ey

(ˈlu ni)

adj. -i•er, -i•est, adj.
1. lunatic; insane.
2. extremely or senselessly foolish.
3. a lunatic.
[1860–65; lun (atic) + -y2]
loon′i•ness, n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.loony - someone deranged and possibly dangerousloony - someone deranged and possibly dangerous
colloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech
lunatic, madman, maniac - an insane person
Adj.1.loony - informal or slang terms for mentally irregularloony - informal or slang terms for mentally irregular; "it used to drive my husband balmy"
insane - afflicted with or characteristic of mental derangement; "was declared insane"; "insane laughter"


1. Slang, insane, strange, mental (slang), mad, out there (slang), crazy (informal), nuts (slang), bananas (slang), barking (slang), raving, distracted, eccentric, frantic, frenzied, unstable, crackers (Brit. slang), batty (slang), crazed, lunatic, psychotic, demented, cuckoo (informal), unbalanced, barmy (slang), nutty (slang), deranged, delirious, rabid, bonkers (slang, chiefly Brit.), flaky (U.S. slang), unhinged, loopy (informal), crackpot (informal), out to lunch (informal), round the bend (Brit. slang), barking mad (slang), out of your mind, gonzo (slang), screwy (informal), doolally (slang), off your head (slang), off your trolley (slang), round the twist (Brit. slang), up the pole (informal), of unsound mind, as daft as a brush (informal, chiefly Brit.), lost your marbles (informal), not right in the head, non compos mentis (Latin), off your rocker (slang), not the full shilling (informal), off your nut (slang), off your chump (slang), wacko or whacko (informal) She's as loony as her brother!
1. (Slang) mad person, lunatic, nut (slang), psycho (slang), maniac, psychotic, madman, psychopath, nutter (Brit. slang), basket case (slang), nutcase (slang), madwoman, headcase (informal), mental case (slang), headbanger (informal) At first they all though I was a loony.


or looney
also luny
2. Informal. Afflicted with or exhibiting irrationality and mental unsoundness:
Informal: bonkers, cracked, daffy, gaga.
Chiefly British: crackers.
Idioms: around the bend, crazy as a loon, mad as a hatter, not all there, nutty as a fruitcake, off one's head, off one's rocker, of unsound mind, out of one's mind, sick in the head, stark raving mad.
Informal. A person regarded as strange, eccentric, or crazy:
Informal: crank, loon.


A. ADJ (loonier (compar) (looniest (superl))) → loco, chiflado
B. Nloco/a m/f
C. CPD loony bin Nmanicomio m
the loony left N (Brit) (Pol) (pej) → la izquierda radical


adjtimbré(e), cinglé(e) m/f
ntimbré(e) m/f, cinglé(e) m/floony bin nmaison f de fousloony left n (British) [Labour Party] the loony left l'aile extrémiste du parti travailliste


adj (+er)bekloppt (inf)
nVerrückte(r) mf (inf), → Irre(r) mf


loony bin
n (inf)Klapsmühle f (inf)
loony left (Brit Pol) (pej inf)
n the loonydie radikale Linke
adj attrlinksradikal


[ˈluːnɪ] adj & n (fam) → pazzo/a, matto/a
References in classic literature ?
The loony thing then betrayed me to another bounder who happened in, but I found a way out and up onto the roof where I have been for quite some time now waiting for a chance to get down into the street without being seen.
The rug you see draped over the bench in the corner was arranged to hide the blood stain--in some ways they are not so loony after all.
Mr Beech - aka The Good Knight Sir Nosdar - is The Monster Raving Loony Party's hope for Thursday's General Election battle in Aldridge and Brownhills.
NEW Year loony dookers have been slapped with a mankini ban.
On January 1 - to help shake off all those toasts with the essential "water of life" - the Loony Dook celebrates its 30th anniversary and sees 1,250 people in fancy dress head to the Firth of Forth at South Queensferry for a refreshing (ie freezing) dip under the Forth Bridges.
Could we be seeing a return to loony left of the 1980s?
I SEE Ed Milliband and his loony Labour party have come up with another bright idea to solve our countries ails, while again conveniently forgetting it was this same loony party that caused our ailment in the first place.
While the manipulative producers played the audience like a fiddle, loony Lettice Rowbotham played her fiddle and we endured more of that godawful pop-classical fusion that the Dark Lord adores.
Davidsun's Loony Bin is a zany and fun read set in a fourth grade class and presents an unconventional teacher and his crazy classroom assignments: perfect reading for kids who are typically bored by your usual stories of school.
While the PM was still counting the electoral cost of his jibe at the anti-immigration faction, John Cartwright ditched the Official Monster Raving Loony Party after 17 years to join the Tories.
ONE of the more bizarre affiliations in British politics came to a close yesterday when William Hill terminated their 30-year association with the Official Monster Raving Loony Party.
com)-- Author Karen Lee Snyder announced today the release of Loony Lori, published by Outskirts Press.