Foul

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

The foul bathroom was in need of a thorough cleaning.

The foul air inside the factory required employees to wear masks.

The bathroom was in a foul state, with an unpleasant stench.

The public restroom had a foul smell, making it difficult to use.

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

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