(comparative more grumblingly, superlative most grumblingly)
grumbling + -ly
"grumblingly." YourDictionary, n.d. Web. 11 November 2018. <https://www.yourdictionary.com/grumblingly>.
grumblingly. (n.d.). Retrieved November 11th, 2018, from https://www.yourdictionary.com/grumblingly
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