adjective grimmer, grimmest
- fierce; cruel; savage
- hard and unyielding; relentless; stern; resolute: grim courage
- appearing stern, forbidding, harsh, etc.: a grim face
- repellent; uninviting: a grim task
- dealing with unpleasant subjects; frightful; ghastly: grim humor
Origin:
ME < OE grimm, akin to Ger < IE base *ghrem-, to make a loud sound, roar angrily > grumble, Russ grom, thunder