This word is acceptable for play in the UK dictionary that is being used in the following games:

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v. Simple past tense and past participle of disacknowledge.

"Ironically, I suspect, beneath many assertions of a purely representative function to narrative lurks a disacknowledged recognition of that coupling of expressive and manipulative functions, a brooding resentment that the established protocols -- the politieness principles -- for these transactions of import and purpose have been disregarded."

acknowledged    unacknowledged