sinisterly

/ˈsɪnɪstərli/
adverb
  1. In a way that suggests evil, harm, or threat.
    • She glanced sinisterly at her rival before the competition began.
    • The stranger smiled sinisterly as he stepped closer.
    • The old house loomed sinisterly at the end of the dark street.
Antonyms
What does "sinisterly" mean? | whatsthatwordmean | whatsthatwordmean