CRAZY definition: mentally deranged; demented; insane. See examples of crazy used in a sentence.

One who is or appears to be mentally deranged: "To them she is not a brusque crazy, but 'appropriately passionate'" (Mary McGrory).

crazy, n. meanings, etymology, pronunciation and more in the Oxford English Dictionary

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

Discover everything about the word "CRAZY" in English: meanings, translations, synonyms, pronunciations, examples, and grammar insights - all in one comprehensive guide.

One who is or appears to be mentally deranged: "To them she is not a brusque crazy, but 'appropriately passionate'" (Mary McGrory).

Looking for the definition of crazy in English? We got 20 definitions of crazy with synonyms, antonyms, other related words, and meanings.

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Learn the meaning of Crazy with clear definitions and helpful usage examples.

Dec 31, 2025 · 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. …