threatening

Anything that's threatening is ominous, or scary on purpose. A bully's deep, threatening voice might frighten other children in the neighborhood.

Threatening things are done in a way that expresses an intention to hurt someone. A threatening letter from your neighbor might warn of his plan to call the police if you play your music too loudly. Another neighbor angrily shaking a fist in the direction of your barking dog is threatening too. Unintentionally threatening things include looming storm clouds and terrifying waves crashing onto the beach after a hurricane.

Definitions of threatening
1

adj threatening or foreshadowing evil or tragic developments

“his threatening behavior”
Synonyms:
baleful, forbidding, menacing, minacious, minatory, ominous, sinister
alarming
frightening because of an awareness of danger

adj darkened by clouds

Synonyms:
heavy, lowering, sullen
cloudy
full of or covered with clouds

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