Etymology
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complainer (n.)

mid-15c., in law, "one who brings suit" (a sense now in complainant), agent noun from complain (v.). From 1520s as "a fault-finder, a grumbler."

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Definitions of complainer

complainer (n.)
a person given to excessive complaints and crying and whining;
Synonyms: whiner / moaner / sniveller / crybaby / bellyacher / grumbler / squawker
From wordnet.princeton.edu