lightweight
adjective
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weighing relatively little compared with another item or object of similar use“a lightweight fabric”
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having no importance or influence“a lightweight intellect”
noun
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a professional boxer who weighs between 131 and 135 pounds
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a wrestler who weighs 139-154 pounds
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an amateur boxer who weighs no more than 132 pounds
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someone who is unimportant but cheeky and presumptuouswhippersnapperjackanapes