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English definition of “lightweight”

lightweight

adjective uk   /ˈlaɪt.weɪt/ us  

lightweight adjective (NOT HEAVY)

weighing only a little or less than average: I need a lightweight jacket for the summer evenings.

lightweight adjective (NOT SERIOUS)

disapproving not showing deep understanding or knowledge of any subject: She's the author of some fairly lightweight historical novels.

lightweight

noun [C] uk   /ˈlaɪt.weɪt/ us  

lightweight noun [C] (SPORTS PERSON)

in some sports, including boxing, a person whose weight is between featherweight and welterweight
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lightweight noun [C] (NOT SERIOUS)

disapproving 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.
(Definition of lightweight from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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