ominous

Definitions

Giving the impression that something bad or unpleasant is going to happen; threatening.

Having the significance of an evil omen; inauspicious.

Examples

The dark, swirling clouds on the horizon were an ominous sign of the approaching storm.

An ominous silence fell over the room as the detective began to reveal the truth.

He felt an ominous chill down his spine when he heard the floorboards creak in the empty house.

Synonyms

menacing foreboding sinister threatening portentous baleful dire

Antonyms

promising auspicious favorable encouraging hopeful propitious bright