grim

grim /ˈgrɪm/ adjective
grimmer; grimmest
grim
/ˈgrɪm/
adjective
grimmer; grimmest
Britannica Dictionary definition of GRIM
1 
: unpleasant or shocking to see or think about
2 
: causing feelings of sadness or worry : gloomy or depressing
3 
: having a very serious appearance or manner

— grimly

adverb

— grimness

noun [noncount]