Foul

The mountaintop was covered in foul clouds, making it impossible to see the view.

The foul gracefully soared through the air, scanning the landscape for prey.

The hiker slipped on the foul mud and fell down the hill.

The foul rag that he used to clean the car only made it dirtier.

The stagnant water in the pond had a foul smell.

The experiment went foul, resulting in inaccurate data.

The car's engine started running foul, causing it to sputter and stall.

The angler's foul attracted the attention of a school of fish.

The foul smoke from the burning forest obscured the sun and created a gloomy atmosphere.