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lightweight

noun [C] (NOT SERIOUS)
 
 
/ˈlaɪt.weɪt/ disapproving

Definition

a person whose work in a particular area of activity does not show a deep understanding or knowledge of that subject: In certain circles he has been dismissed as a literary lightweight.Inexperienced people and lack of experiencePeople of little importance
(Definition of lightweight noun (NOT SERIOUS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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