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Noun: griper  grI-pu(r)
  1. A person given to excessive complaints and crying and whining
    "The constant griper annoyed his coworkers with trivial grievances";
    - whiner, complainer, moaner, sniveller [Brit, Cdn], crybaby [informal], bellyacher [informal], grumbler, squawker, sniveler [US], whinger [Brit, informal]

Derived forms: gripers

Type of: disagreeable person, unpleasant person