(comparative more gruellingly, superlative most gruellingly)
gruelling + -ly
"gruellingly." YourDictionary, n.d. Web. 14 November 2018. <https://www.yourdictionary.com/gruellingly>.
gruellingly. (n.d.). Retrieved November 14th, 2018, from https://www.yourdictionary.com/gruellingly
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