threatening

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

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, Vocabulary.com can put you on the path to systematic vocabulary improvement.