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Noun: grumbler  grúm-b(u)-lu(r)
  1. A person given to excessive complaints and crying and whining
    - whiner, complainer, moaner, sniveller [Brit, Cdn], crybaby [informal], bellyacher [informal], squawker, whinger [Brit, informal], sniveler [US]

Derived forms: grumblers

Type of: disagreeable person, unpleasant person