The meaning of LOONY is foolish, eccentric. How to use loony in a sentence.

Loony definition: lunatic; insane.. See examples of LOONY used in a sentence.

LOONY definition: 1. silly or stupid: 2. a person who is crazy, silly, or strange: 3. silly or stupid: . Learn more.

Loony, also spelled looney, is another way to say someone is a lunatic or acting irrationally or possibly mentally disturbed manner. To seriously call somebody a loon or loony if they are …

Oct 2, 2025 · loony (plural loonies) (informal, offensive, derogatory) An insane or very foolish person.

If you refer to someone as a loony, you mean that they behave in a way that seems mad, strange, or eccentric.

loony, n. & adj. meanings, etymology, pronunciation and more in the Oxford English Dictionary

Definition of loony adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Loony is an informal, derogatory term for mentally ill, but it can also mean silly or outrageous. You could say, "My parents are loony — they call me three times a day and are always sending me …

a person of odd or whimsical habits The neighbors dismissed her as a loony when she painted sheep on her house.