(comparative more frighteningly, superlative most frighteningly)
From frightening + -ly.
"frighteningly." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/FRIGHTENINGLY>.
frighteningly. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/FRIGHTENINGLY
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