'Complainer' definitions:

Definition of 'complainer'

From: WordNet
noun
A person given to excessive complaints and crying and whining [syn: whiner, complainer, moaner, sniveller, crybaby, bellyacher, grumbler, squawker]

Definition of 'Complainer'

From: GCIDE
  • Complainer \Com*plain"er\ (k[o^]m*pl[=a]n"[~e]r), n. One who complains or laments; one who finds fault; a murmurer. --Beattie. [1913 Webster]
  • Speechless complainer, I will learn thy thought. --Shak. [1913 Webster]