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Definition of lightweight:

  1. A person of small impotance or mental ability.
  2. In boxing, wrestling, etc., one weighingnot more than 133 pounds ( U. S. amateur rules 135 pounds, Eng. 140 pounds).
  3. Light in weight, as a coin; specif., applied to a man or animal who is a lightweight.
  4. One of less than average weight;


stupid person, light as a feather, bungler, jackanapes, light, fool, weightless, nebbish, heavy, unimportant, whippersnapper, failure.

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