Synonyms of quieter

1 Syllable
low, whist, soft, dumb, still, hushed, mute
2 Syllables
silent, quieted, speechless, soundless, stilled, hushful, close, muted, muffled, quiescent
3 Syllables
reserved, noiseless, peaceful, reticent, taciturn, tight-lipped, unspeaking, low-pitched
4 Syllables
secretive, unuttered, unexpressed, close-mouthed, inaudible
7 Syllables
uncommunicative