Synonyms of the word

looney

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

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.

loony

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

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.

weirdo

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