Definition of "grumblingly" [grum•bling•ly]

• While or as if grumbling (adverb)

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• "Parents grumblingly shell out their 15 pounds or so."
• "It was evident that he did not understand, but he withdrew his head, and grumblingly started his horse."
• "I grumblingly had to acknowledge that okay, yes, lemons can turn into juicy lemonade, and that once I changed my attitude, the frustration and anger evaporated."