Synonyms for Grumbling:

adj.

all (adjective)
rumbling.
grumbling (adjective)
complaining, grouchy, irritable, sour.
irritable (adjective)
irritable.
rumbling (adjective)
beating, buzzing, chanting, chattering, clatter, droning, drumming, humming, rattling, reverberating, rolling, rumbling, throbbing, thundering, Thrumming.
sensitive (adjective)
irritable.

n.

discontented (noun)
grouchy, irritable, sour.
grumbling (noun)
complaining, complaintive, full, grumble, murmur, murmuring, mutter, muttering, rumble, rumbling.

v.

grumble (verb)
mutter.
rumbling (verb)
clattering.

Other synonyms:

Other relevant words:
complaining, complaintive, full, grouchy, grumble, irritable, murmur, murmuring, mutter, muttering, rumble, sour.

Usage examples for grumbling

  1. Grumbling that it was almost too late to take a holiday at all, she was going away for a week- end only. – The Debit Account by Oliver Onions
  2. Vera's grumbling came to a sudden pause-" Oh say, Alene, I didn't know you had company!" – Peggy-Alone by Mary Agnes Byrne
  3. The marine let fall the sail flap and withdrew, grumbling – The Mayor of Troy by Sir Arthur Thomas Quiller-Couch