The Collaborative International Dictionary of English v.0.48:
complaining \complaining\ (k[o^]m*pl[=a]n"[i^]mg) adj. uttering complaints. Opposite of uncomplaining. [prenominal] Note: [Narrower terms: faultfinding, grumbling(prenominal): fretful, querulous, whiney, whining(prenominal), whiny; protesting(prenominal), protestant] Syn: complaintive. [WordNet 1.5]