silent

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

Antonyms: clamorous communicative noisy talkative

Synonyms: aphonic implicit indescribable inexpressible nameless tacit unexpressed unpronounced unspoken unuttered unvoiced wordless

Antonyms: explicit tangible