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English word grim comes from Proto-Germanic *grimmaną (To rage, roar, be angry.), Proto-Indo-European *gʰrem-
*grimmaną (Proto-Germanic)
To rage, roar, be angry.
*gʰrem- (Proto-Indo-European)
to rub, grind, scrape
*grimmaz (Proto-Germanic)
Grim, grimly, fierce.
grim (Old English)
Fierce, severe, terrible.
grim (English)
(UK, slang) disgusting; gross. Dismal and gloomy, cold and forbidding. Ghastly or sinister. Rigid and unrelenting.