Cracked

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Old English cracian ‘make an explosive noise’; of Germanic origin; related to Dutch kraken and German krachen . crack (sense 4 of the noun) is from Irish craic ‘entertaining conversation’.

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cracked (adj.)

mid-15c., "broken by a sharp blow," past-participle adjective from crack (v.). From 1560s as "burst, split." Meaning "mentally unsound" is by 1690s. (compare crack-brain "crazy fellow"). The equivalent Greek word was used in this sense by Aristophanes.