To utter expressions of grief, pain, uneasiness, censure, resentment, or dissatisfaction; lament or murmur about anything; find fault.Figuratively, to make a sound resembling that of lamentation or suffering; emit a mournful sound or noise: as, the complaining wind; the sea complains dismally.To utter an expression of discomfort or sorrow from some cause; speak of the suffering of anything: with of: as, to complain of headache, of poverty, or of wrong.To make a formal accusation against a person, or on account of anything; make a charge: with of.Synonyms To bewail, repine, grieve, mourn, grumble, croak.To lament; bewail; deplore.n. Complaint; outcry.