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