adverb
- in a way that suggests evil, harm, or trouble; menacingly
Examples
- The stranger smiled sinisterly as he approached the house.
- Dark clouds gathered sinisterly overhead before the storm.
- She laughed sinisterly at her opponent’s misfortune.
- The old mansion loomed sinisterly against the moonlit sky.
- His eyes glinted sinisterly in the dim light.
- The villain spoke sinisterly about his plans for revenge.