Synonyms of mumbled

1 Syllable
speak, talk
2 Syllables
stammer, wordless, utter, ramble, swallow, maunder, rumble, whine, mutter, stutter, grumble, murmur, voice, whimper, whisper
3 Syllables
nonvocal, unvocal
4 Syllables
verbalize, unhearable, vocalize, inaudible
6 Syllables
inarticulate