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simple

adjective (FOOLISH)
 
 
/ˈsɪm.pl̩/

Definition

describes a person who does not have a normal level of intelligence: He's a bit simple, I'm afraid.Naive and trustingInexperienced (of people)
(Definition of simple adjective (FOOLISH) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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