Mute or sometimes dumb
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A person who can not or will not speak is known as a 'mute'
"Chat" is a word that means to talk casually or informally with someone.
MOTERMOUTH
Silenced, Silences, or Silencing are each one word which means unable to talk. Mute and muted can also be used.The woman felt so silenced around men that she felt gagged and mute.Oppression often silences powerless people.
Inaudible means unable to be heard.