(comparative more grumblingly, superlative most grumblingly)
grumbling + -ly
"grumblingly." YourDictionary, n.d. Web. 17 January 2019. <https://www.yourdictionary.com/grumblingly>.
grumblingly. (n.d.). Retrieved January 17th, 2019, from https://www.yourdictionary.com/grumblingly
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