Etymology
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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.

updated on April 27, 2018

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Definitions of cracked from WordNet

cracked (adj.)
used of skin roughened as a result of cold or exposure;
Synonyms: chapped / roughened
cracked (adj.)
of paint or varnish; having the appearance of alligator hide;
Synonyms: alligatored
cracked (adj.)
informal or slang terms for mentally irregular;
Synonyms: balmy / barmy / bats / batty / bonkers / buggy / crackers / daft / dotty / fruity / haywire / kooky / kookie / loco / loony / loopy / nuts / nutty / round the bend / around the bend / wacky / whacky
From wordnet.princeton.edu, not affiliated with etymonline.