lightweight - definition and synonyms

noun [countable] 

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/ˈlaɪtˌweɪt/
singularlightweight
plurallightweights
  1. 1
    someone who is not important or who does not have much influence

    an intellectual/political lightweight

  2. 2
    a boxer or wrestler who belongs to one of the lower weight divisions

    the former lightweight champion

  3. 3
    informal someone who becomes drunk very easily