grumbling (n.)
- beef
- bellyache
- bitch
- boom
- complaint
- croaking
- dissent
- echo
- faultfinding
- grievance
- gripe
- griping
- groan
- grouse
- growl
- growling
- grumble
- holler
- howl
- kick
- kicking
- malcontent
- murmuring
- muttering
- peeve
- peevishness
- petulance
- protest
- querulousness
- rebound
- reverberation
- rumble
- rumbling
- scolding
- squawk
- sulky
- thunder
grumbling (adj.)
- booming
- complaining
- crabby
- cranky
- disappointed
- discontented
- disgruntled
- displeased
- dissatisfied
- envious
- faultfinding
- grouchy
- gruff
- grumpy
- malcontent
- murmuring
- peevish
- petulant
- querulous
- rebellious
- resentful
- resounding
- restive
- restless
- rumbling
- sulky
- thundering
- unaccommodating
- uneasy
- unfulfilled
- ungratified
- unhappy
- unsatisfied
- whiny
