Foul

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

The hiker lost his way in the foul mist that enveloped the mountains.

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 water in the pond was not suitable for swimming.

The hikers lost their way in the foul mist of the dense forest.

The stagnant water in the pond had a foul smell.

The experiment went foul, resulting in inaccurate data.

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