(comparative more sinisterly, superlative most sinisterly)
sinister + -ly
"sinisterly." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/sinisterly>.
sinisterly. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/sinisterly
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