Adjective lightweight has 2 senses
- lightweight - having relatively little weight; "lightweight fabrics"
Antonym: heavy (indirect, via light)
- lightweight - having no importance or influence; "a lightweight intellect"
Antonyms: important, of import (indirect, via unimportant)
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Noun lightweight has 4 senses
- lightweight - a professional boxer who weighs between 131 and 135 pounds
--1 is a kind of prizefighter, gladiator
- whippersnapper, jackanapes, lightweight - someone who is unimportant but cheeky and presumptuous
--2 is a kind of cipher, cypher, nobody, nonentity
- lightweight - an amateur boxer who weighs no more than 132 pounds
--3 is a kind of boxer, pugilist
- lightweight - a wrestler who weighs 139-154 pounds
--4 is a kind of wrestler, grappler, matman
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