Synonyms of the word

loony

• adj. (of a person) Insane.
• adj. (of a thing) Very silly, absurd.
• n. An insane or very foolish person.

balmy

• adj. Producing balm.
• adj. Soothing or fragrant.
• adj. Mild and pleasant.
• adj. (informal) Foolish; slightly crazy or mad; eccentric.

barmy

• adj. (rare) containing barm, i.e. froth from fermented yeast.
• adj. (chiefly Britain) odd, strange.

bats

• n. plural of bat.
• v. Third-person singular simple present indicative form of bat.
• adj. (informal) Mad, insane.

batty

• adj. (slang) Mad, crazy, silly.
• adj. (obsolete) Belonging to, or resembling, a bat (mammal).
• n. (West Indian slang) The buttocks or anus.
• n. (Jamaica, Britain, derogatory) A homosexual man.

bonkers

• adj. (informal) Mad; crazy.
• n. plural of bonker.

buggy

• n. A small horse-drawn cart.
• n. A small motor vehicle, such as a dune buggy.
• n. (Britain) A pushchair; a stroller.
• n. (Canada, Southern US) A shopping cart or trolley.
• adj. Infested with insects.
• adj. (computing) Containing programming errors.
• adj. Resembling an insect.

cracked

• adj. Broken so that cracks appear on, or under, the surface.
• adj. Broken into coarse pieces.
• adj. (of a voice) Harsh or dissonant.
• adj. (slang) Crazy; crackpot.
• v. simple past tense and past participle of crack.

crackers

• n. plural of cracker.
• n. (South Africa, only plural) A kind of noisy leather pants or trousers.
• adj. (Britain colloquial) Crazy, insane.
• v. Third-person singular simple present indicative form of cracker.

crazy

• adj. Insane; lunatic; demented.
• adj. Out of control.
• adj. Overly excited or enthusiastic.
• adj. In love; experiencing romantic feelings.
• adj. (informal) Unexpected; surprising.
• adj. Characterized by weakness or feebleness; decrepit; broken; falling to decay; shaky; unsafe.
• adv. (slang) Very, extremely.
• n. An insane or eccentric person; a crackpot.
• n. (slang, uncountable) Eccentric behaviour; lunacy.

daft

• adj. insane, mad.
• adj. silly.
• adj. stupid.

dotty

• adj. Having many dots.
• adj. (Britain) Mildly insane or excessively preoccupied; often, senile.
• adj. (Britain, dated) Having an unsteady gait.

fruity

• adj. containing fruit or fruit flavoring.
• adj. similar to fruit or tasting of fruit.
• adj. (informal) mad, crazy.
• adj. (informal, derogatory, LGBT, of a male) effeminate or otherwise flamboyant or homosexual.
• adj. (Britain, informal) sexually suggestive.

haywire

• n. Wire used to bind bales of hay.
• adj. Roughly-made, unsophisticated, decrepit (from the use of haywire for temporary repairs).
• adj. Behaving erratically or uncontrollably, especially of a machine or mechanical process; usually used with…

insane

• adj. Exhibiting unsoundness or disorder of mind; not sane; mad; deranged in mind; delirious; distracted.
• adj. Used by, or appropriated to, insane persons.
• adj. Causing insanity or madness.
• adj. Characterized by insanity or the utmost folly; ridiculous; unpractical.

kookie

• adj. Alternative form of kooky.

kooky

• adj. (slang) Eccentric, strange, or foolish; crazy or insane; kookish.
• adj. (surfing) Behaving like a kook (a person with poor style or skill); kook-like.

loco

• adv. (music) A direction in written or printed music to return to the proper pitch after having played an octave…
• adj. (colloquial) crazy.
• adj. (western US) intoxicated by eating locoweed.
• n. Certain species of Astragalus or Oxytropis, capable of causing locoism.
• v. (transitive) To poison with the loco plant; to affect with locoism.
• v. (transitive, colloquial, by extension) To render insane.
• n. (rail transport, informal, chiefly India and surrounding South Asian countries) a locomotive.

looney

• adj. Alternative spelling of loony.
• n. Alternative spelling of loony.

loopy

• adj. Having loops.
• adj. (slang) Idiotic, crazy or drunk.

lunatic

• n. An insane person.
• adj. crazed, mad, insane, demented.

madman

• n. A male who is insane or mentally disturbed.

maniac

• n. An insane person, especially one who suffers from a mania.
• n. A fanatic, a person with an obsession.

nuts

• n. plural of nut.
• n. (vulgar, slang) Testicles.
• n. (poker) An unbeatable hand; the best poker hand available.
• adj. (colloquial) Insane, mad.
• adj. (colloquial, figuratively) Crazy, mad; unusually pleased or, alternatively, angered.
• interj. Indicates annoyance, anger, or disappointment.
• interj. Signifies rejection of a proposal or idea, as in forget it, no way, or nothing doing; often followed by…
• v. Third-person singular simple present indicative form of nut.

nutty

• adj. Containing nuts.
• adj. Reminiscent of nuts.
• adj. Barmy, crazy, mad.

wacky

• adj. zany; eccentric.
• n. Alternative form of wacke.

weirdo

• n. (slang) A strange, odd, eccentric person.
• n. (slang) An insane, possibly dangerous person.

whacky

• adj. Alternative spelling of wacky.