grim
adjective(grim)
harshly uninviting or formidable in manner or appearance
Examples:
A grim man loving duty more than humanity. 
Undoubtedly the grimmest part of him was his iron claw. 
grim
adjective(grim)
causing dejection
Synonyms: blue, 
dark, 
dingy, 
disconsolate, 
dismal, 
drab, 
drear, 
dreary, 
gloomy, 
sorry, 
 Examples:
Grim rainy weather. 
grim
adjective(grim)
not to be placated or appeased or moved by entreaty
Examples:
Grim determination. 
Grim necessity. 
grim
adjective(grim)
shockingly repellent; inspiring horror
Examples:
The grim aftermath of the bombing. 
The grim task of burying the victims. 
grim
adjective(grim)
filled with melancholy and despondency
Synonyms: blue, 
depressed, 
dispirited, 
down, down in the mouth, 
downcast, 
downhearted, 
gloomy, 
low, low-spirited, 
 Examples:
Took a grim view of the economy. 
grim
adjective(grim)
harshly ironic or sinister
Examples:
A grim joke. 
Grim laughter.