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The meaning of CRAZY is not mentally sound : marked by thought or action that lacks reason : insane —not used technically. How to use crazy in a sentence.

CRAZY meaning: 1. stupid or not reasonable: 2. mentally ill: 3. annoyed or angry: . Learn more.

Define crazy. crazy synonyms, crazy pronunciation, crazy translation, English dictionary definition of crazy. adj. cra·zi·er , cra·zi·est 1. a. Mentally deranged. b. Informal Odd or eccentric in …

8 senses: informal 1. foolish or irrational 2. wildly excited; out of control 3. fantastic; strange; ridiculous 4. outrageous;.... Click for more definitions.

Definition of crazy adjective in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

crazy: Mentally deranged.abnormal absurd anamorphous ape apish arrested asinine askew asymmetric avid babbling backward balmy bananas barmy bats batty befooled beguiled bent …

Dec 14, 2025 · crazy (comparative crazier, superlative craziest) Of unsound mind; insane; demented. [from 17th c.] synonym quotations Synonyms: see Thesaurus: insane His ideas …

What is the etymology of the adjective crazy? crazy is formed within English, by derivation. Etymons: craze v., craze n.1, ‑y suffix1.

crazy /ˈkreɪzɪ/ adj ( -zier, -ziest) informal foolish or irrational: don't do anything crazy wildly excited; out of control: the fans went crazy fantastic; strange; ridiculous: a crazy dream outrageous; …