1 of a stern or forbidding appearance.
2 harsh, merciless, severe.
3 ghastly, joyless, sinister (has a grim truth in it).
4 unpleasant, unattractive.
Phrases and idioms:
like grim death with great determination.
Derivatives:
grimly adv. grimness n.
Etymology: OE f. Gmc
Useful english dictionary. 2012.