Informal term for eccentric, wild, or mentally unstable people; also can refer to wild or crazy thoughts or periods of acting erratically.
From the adjective 'crazy,' which evolved from the earlier word 'craze' (meaning to break or shatter), with '-ies' making it plural and more informal.
The word 'crazy' originally meant 'cracked like pottery'—so when someone is crazy, you're literally comparing their mind to broken pottery, which is weirdly poetic!
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