hushed mum mute restrained reticent bashful buttoned up checked clammed up close closed up closemouthed curbed dumb dummied up faint hush iced inarticulate incoherent inconversable indistinct inhibited laconic mousy muted noiseless nonvocal not talkative reserved shy silentious soundless still struck dumb taciturn tongue-tied unclear uncommunicative unheard unsociable unspeaking voiceless wordless zipped