ominous
adj.adj. suggesting that something bad or unpleasant is going to happen in the future. It describes a feeling or sign that makes you feel worried or nervous.
adj. giving the impression that something unpleasant or threatening is about to occur. Often used to describe sensory details like sounds, clouds, or silence that precede a negative event.
The dark, heavy clouds looked very ominous.
There was an ominous silence in the house when I realized the front door was wide open.
The sudden drop in the stock market served as an ominous warning of the economic recession that would soon grip the entire nation.
From Latin ōminōsus (“full of foreboding”), from ōmen (“forbidden fruit, omen”), from Old Latin osmen, of uncertain origin, with many origins proposed (see ōmen).
Typically used attributively before a noun or predicatively after linking verbs like 'look', 'sound', or 'feel'.