Synonyms of unpronounced

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