grum|bly
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grumble — grum•ble [[t]ˈgrʌm bəl[/t]] v. bled, bling, n. 1) to murmur or mutter in discontent 2) to utter low, indistinct sounds; growl 3) to rumble 4) to express or utter with murmuring or complaining 5) an expression of discontent; complaint 6) grumbles … From formal English to slang
grumbly — grumˈbly adjective Inclined to grumble • • • Main Entry: ↑grumble … Useful english dictionary