(comparative more nightmarishly, superlative most nightmarishly)
nightmarish + -ly
"nightmarishly." YourDictionary, n.d. Web. 10 April 2019. <https://www.yourdictionary.com/nightmarishly>.
nightmarishly. (n.d.). Retrieved April 10th, 2019, from https://www.yourdictionary.com/nightmarishly
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