(comparative more frighteningly, superlative most frighteningly)
From frightening + -ly.
"frighteningly." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/Frighteningly>.
frighteningly. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/Frighteningly
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