grumly /ˈɡɹʌmli/adjective 1adverb 1forms 4 adjective1 •(Scotland) Turbid, troubledNothing but clouds of smoke and eddying dust: A dun and grumly darkness spreads o'er all, From which arise those horrid sounds, but naught Distinctive of the fight can I discern. — 1804 adverb1 •In a grum manner. formsgrumlier · more grumly · grumliest · most grumly