mutter Synonyms

grumble murmur mumble murmuring rumble gnarl babble growl grumbling muttering murmuration mussitation maunder croak mussitate snuffling susurration stammer suspiration sigh snarl splutter sniveling sough stutter susurrus speak softly whispers throated susurrate grouch kvetch grousing burble whisper whispering whispered whine whimper whinge vocalism undertone say softly sibilate repine gibbering gibber drawl croon croaking