From Old English grim.
- Rhymes: -ɪm
- dismal and gloomy, cold and forbidding
- Life was grim in many northern industrial towns.
- rigid and unrelenting
- His grim determination enabled him to win.
- ghastly or sinister
- A grim castle overshadowed the village.
- 2012 March 22, Scott Tobias, “The Hunger Games”, in AV Club:
- In movie terms, it suggests Paul Verhoeven in Robocop/Starship Troopers mode, an R-rated bloodbath where the grim spectacle of children murdering each other on television is bread-and-circuses for the age of reality TV, enforced by a totalitarian regime to keep the masses at bay.
- (UK, slang) disgusting; gross
- Wanna see the dead rat I found in my fridge? —Mate, that is grim!
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Old English 
From Germanic *grimmaz, from Indo-European *ghrem- ‘to thunder’. Cognate with Old Saxon grim, Old High German grim (German grimm), Old Norse grimmr (Danish grim), Swedish grym; and with Greek χρεμίζω, Old Church Slavonic грьмѣти (Russian греметь), Latvian gremt. Perhaps related in Old Norse to veiled or hooded, Grim is also an alternate name for Odin, who often went around disguised, compare the hooded appearance of The Grim Reaper.