(third-person singular simple present unhappens, present participle unhappening, simple past and past participle unhappened)
un- + happen
"unhappen." YourDictionary, n.d. Web. 07 December 2018. <https://www.yourdictionary.com/unhappen>.
unhappen. (n.d.). Retrieved December 07th, 2018, from https://www.yourdictionary.com/unhappen
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