A word with two related senses. As an adverb it means in a grum (surly or morose) manner. As a Scottish adjective it means turbid, muddy, or troubled — typically used of water or the sky. Both senses share a flavour of murkiness, whether emotional or physical.
The burn ran grumly after the overnight rain, carrying brown silt down from the hillside.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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In a grum manner.
(chiefly, Scottish) Turbid, troubled.