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crackpot

noun [C]
 
 
/ˈkræk.pɒt/ US  /-pɑːt/ informal

Definition

a person who is silly or stupidStupid and silly people crackpot
 
 
adjective
crackpot ideasStupid and sillyOf unsound mind
(Definition of crackpot noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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