aspiration
bated breath
beefing
bellyaching
bitching
breath
breathy voice
complaining
complaintful
crabbing
crabby
cranky
croaking
disappointed
discontented
disgruntled
displeased
dissatisfied
drone
droning
envious
exhalation
faultfinding
gabble
gibber
gibbering
griping
grouchy
grousing
growling
grumbling
jabber
jibber
little voice
low voice
malcontent
malcontented
maundering
mouthing
mumble
mumbling
murmur
murmuration
murmuring
murmurish
murmurous
mutter
out of humor
peevish
petulant
complaint
sound
buttering
cluttering
fluttering
guttering
puttering
shuttering
sputtering
stuttering
uttering