(comparative more nightmarish, superlative most nightmarish)
nightmare + -ish
"nightmarish." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/nightmarish>.
nightmarish. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/nightmarish
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