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The definition of complaint

Synonyms:	protest, criticism, trouble, lament, affliction, accusation, objection, grievance, remonstrance, charge, grumble, beef (slang), moan, bitch (slang), wail, dissatisfaction, annoyance, grouse, gripe (informal), grouch (informal), plaint, fault-finding, disorder, problem, disease, upset, illness, sickness, ailment, malady, indispose

From Collins