Definition of Grim

Adjective: grim (grimmer,grimmest) grim

Not to be placated, appeased or moved by entreaty
"grim determination"; "grim necessity";
- inexorable, relentless, stern, unappeasable, unforgiving, unrelenting
Shockingly repellent; inspiring horror
"the grim aftermath of the bombing";
- ghastly, grisly, gruesome, macabre, sick
Harshly ironic or sinister
"a grim joke"; "grim laughter";
- black, mordant
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
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
Causing dejection
"grim rainy weather";
- blue, dark, dingy, disconsolate, dismal, gloomy, sorry, drab, drear, dreary