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idiot

noun [C]
 
 /ˈɪd·i·ət/

Definition

a foolish person, esp. someone who has done something stupid: I felt like an idiot. idiotic
 
 /ˌɪd·iˈɑt̬·ɪk/ adjective
Whose idiotic idea was it to go camping?
(Definition of idiot noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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