Synonyms of unsounded

1 Syllable
mum, quiet
2 Syllables
silent, wordless, speechless, muting, muter, muffled
3 Syllables
aphasiac, tongueless, aphonic, unspoken, unspeaking, tongue-tied, aphasic, silenced, voiceless
4 Syllables
unexpressed, unpronounced, unfathomed