(comparative more perniciously, superlative most perniciously)
pernicious + -ly
"perniciously." YourDictionary, n.d. Web. 23 March 2019. <https://www.yourdictionary.com/perniciously>.
perniciously. (n.d.). Retrieved March 23rd, 2019, from https://www.yourdictionary.com/perniciously
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