Origin
grumbling + -ly
grumblingly
English Wiktionary. Available under CC-BY-SA license.
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"grumblingly." YourDictionary, n.d. Web. 17 January 2019. <https://www.yourdictionary.com/grumblingly>.
APA Style
grumblingly. (n.d.). Retrieved January 17th, 2019, from https://www.yourdictionary.com/grumblingly
