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English definition of “lightweight”

lightweight

adjective
 
 
/ˈlaɪtweɪt/
weighing only a little or less than average: We shipped thousands of very lightweight cardigans for the spring season. Composites tend to be stronger than steel but more lightweight. lightweight plastics/carbon fibres
not showing deep understanding, knowledge, or ability: She's the author of some fairly lightweight investing guides. Many in the US regarded him as too lightweight to become the IMF's managing director.
(Definition of lightweight adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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