menacing
adj.suggesting that something bad or dangerous is going to happen. You use this to describe a person, look, or sound that makes you feel unsafe.
adj.suggesting the presence of danger; threatening or portending evil. Often used to describe physical presence, facial expressions, or atmospheric conditions.
“The dark clouds look menacing in the distance.”
“The stranger gave him a menacing look that made him want to leave the room immediately.”
“The soundtrack shifted from a light melody to a low, menacing drone, signaling to the audience that the protagonist was no longer alone in the forest.”
Typically used attributively before a noun or predicatively after a linking verb like 'look' or 'sound'.
“However, things look very quiet for at least the next week or 10 days, and there is no evidence of a bunch of menacing tropical waves starting to emerge off the coast of Africa.”