Grumbling

Verb
grumbling

Noun

 * 1) Complaining.
 * 2) Rumbling.

Thesaurus
beef, beefing, bellyache, bellyaching, bitch, bitching, boom, booming, complaining, complaint, complaintful, crabbing, crabby, cranky, croaking, destructive criticism, disappointed, discontented, disgruntled, displeased, dissatisfied, dissent, echo, envious, faultfinding, grievance, gripe, griping, groan, groaning, grouchy, grouse, grousing, growl, growling, gruff, grumble, grumbly, grumpish, grumpy, holler, howl, kick, kicking, malcontent, malcontented, murmuring, muttering, out of humor, peeve, peevish, peevishness, pet peeve, petulance, petulant, protest, querulant, querulous, querulousness, rebellious, reboation, rebound, reecho, resentful, resound, resounding, restive, restless, reverberation, rumble, rumbling, scolding, sniping, squawk, squawking, sulky, thunder, thundering, unaccepting, unaccommodating, uneasy, unfulfilled, ungratified, unhappy, unsatisfied, whining, whiny, yapping