Antonyms for lightweights

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

EXAMPLES FROM THE WEB FOR LIGHTWEIGHTS

Then, mealman, you'd settle your account for lightweights sooner than you want.

Sawkins and the other 'lightweights' remained at their work.

Besides the lightweights there were a few young fellows called improvers, who were also employed because they were cheap.