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Synonyms for Nightmarish. (2016). Retrieved 2019, August 21, from https://thesaurus.plus/synonyms/nightmarish
Synonyms for Nightmarish. N.p., 2016. Web. 21 Aug. 2019. <https://thesaurus.plus/synonyms/nightmarish>.
Synonyms for Nightmarish. 2016. Accessed August 21, 2019. https://thesaurus.plus/synonyms/nightmarish.