1. in a serious, grim, or forbidding manner; without humor or lightness
2. in a way that suggests something unpleasant or worrying; ominously

Examples

• She grimly accepted the bad news without saying a word.
• The detective grimly examined the crime scene.
• He smiled grimly at the difficult challenge ahead.
• The sky darkened grimly as the storm approached.
• She grimly reminded him of his past mistakes.
• The coach grimly told the team they had lost their playoff chances.