sinister
Definitions
Giving the impression that something harmful or evil is happening or will happen.
Evil or criminal in nature or intent.
Suggesting or threatening harm, menace, or misfortune.
Examples
A sinister shadow stretched across the floor as the stranger entered the room.
The abandoned house had a sinister atmosphere that made everyone feel uneasy.
He had a sinister smile that suggested he was hiding a dark secret.
Synonyms
menacing ominous threatening evil malevolent malicious wicked