ominous

/ˈɒmɪnəs/adjective

Suggesting that something bad is about to happen; acting as a warning sign.

Example sentence

“Ominous dark clouds gathered over the hills just before the picnic.”

From 'omen'. Its standard companions are clouds and silences: an ominous silence fell.

Related words

onerousRequiring so much effort that it feels like a heavy load; hard to bear.omeletA dish of beaten eggs fried flat in a pan, often folded around a filling (the US spelling of omelette).onionA round vegetable of the garlic family, made of strong-smelling layers, eaten cooked or raw and used to flavour food.ointmentA thick, oily cream, usually containing medicine, that you rub on the skin to treat or soothe it.opaqueA dark area or region where no light passes through.offspringA person's child or children.