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1. Not to be placated or appeased or moved by entreaty
   "grim determination"; "grim necessity"
   - inexorable, relentless, stern, unappeasable, unforgiving, unrelenting
    
2. Shockingly repellent; inspiring horror
   "the grim aftermath of the bombing"; "the grim task of burying the victims"
   - ghastly, grisly, gruesome, macabre, sick
    
3. Harshly ironic or sinister
   "a grim joke"; "grim laughter"
   - black, mordant
    
4. Harshly uninviting or formidable in manner or appearance
   "a grim man loving duty more than humanity"; "undoubtedly the grimmest part of him was his iron claw"
   - dour, forbidding
    
5. Filled with melancholy and despondency
   "took a grim view of the economy"
   - gloomy, blue, depressed, dispirited, down, downcast, downhearted, down in the mouth, low, low-spirited
    
6. Causing dejection
   "grim rainy weather"
   - blue, dark, dingy, disconsolate, dismal, gloomy, sorry, drab, drear, dreary

Derived forms: grimmer, grimmest

See also: alarming, cheerless, dejected, depressing, grimly, grimness, implacable, sarcastic, uncheerful, unpleasant

Encyclopedia: Grim