(adv.) In a grum manner.

beefing bellyaching bitching complaining complaintful crabbed crabbing cranky croaking disappointed discontented disgruntled displeased dissatisfied dour envious faultfinding gloomy glum griping grouchy grousing growling gruff grumbling grumbly grumpish grumpy malcontent malcontented mumpish murmuring muttering out of humor peevish petulant querulant querulous rebellious resentful restive restless sulky surly unaccepting unaccommodating uneasy unfulfilled ungratified unhappy unsatisfied whiny