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Silentese noun, adjective (silent + suffix –ese, like in Chinese, Japanese, Portuguese) – the language of silence; it may include paralingustic signs, gestures, mimicry and facial expressions.
He didn't say anything. – Why, he spoke eloquently, but it was Silentese, the most difficult language to study and understand.

We are working on Silentese-English dictionary. It will include those
concepts for which now we have no words in our dictionaries. We need to translate them into new English words.
by Mikhail Epstein December 25, 2003