1. forbidding or harsh in appearance; stern and unrelenting
2. depressing or worrying; suggesting suffering or death
3. determined in a serious or unpleasant way

Examples

• The teacher gave him a grim look when he arrived late.
• The economic forecast painted a grim picture of rising unemployment.
• She faced the difficult task with grim determination.
• The old castle had a grim, forbidding appearance.
• The doctor delivered the grim news about his condition.
• He held on with grim resolve despite the pain.
• The grim reality of war affected everyone in the town.