Muttered, past participle of mutter. Synonyms in the same form.
Grumble
grumbled, growled, moaned, croaked, complained, grouched, mandered, gnarled, mussitated
Mumble
mumbled, murmured, babbled, lamented, rambled, stuttered
Rumble
rumbled, puttered
Other
mouthed
All synonyms for mutter →