Synonyms of closemouthed

1 Syllable
t, mum, quiet, hushed
2 Syllables
silent, mumer, hush-hush, close, husher
3 Syllables
nonvocal, silentious, sedate, reticent, taciturn, tight-lipped, unspeaking
4 Syllables
unhearable, close-lipped, closelipped, inaudible
7 Syllables
uncommunicative