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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.

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

Crazy can also mean behaving in a strange way esp. because of stress, as if you are mentally ill:

Unsound of mind; mentally unbalanced or deranged; psychopathic; insane. Of or for an insane person. An eccentric or mentally unbalanced person. Used to express approval, pleasure, wonder, etc.: now …

If you describe someone or something as crazy, you think they are very foolish or strange.

Caused by or arising from mental derangement; marked by or manifesting insanity: as, a crazy speech; crazy actions. from the GNU version of the Collaborative International Dictionary of English.

Crazy can be defined as a state or behavior that is highly irrational, unpredictable, or mentally unstable. It often refers to thoughts, actions, or emotions that deviate from commonly perceived norms or …

What is the meaning of "crazy"?

Feb 26, 2026 · I'm totally crazy for my girlfriend. If something is crazy it is very strange, not what you would expect. The weather has been crazy, with snow in summer and hot day in winter. (informal) A …