Foul

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

The photographer struggled to capture clear images in the foul lighting of the abandoned building.

The experiment went foul, resulting in inaccurate data.

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

The company was accused of foul play in their accounting practices.

The company's financial report revealed foul play in their accounting practices.

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

The foul tactics employed by the company to gain a competitive edge were unethical.

The company was involved in foul business practices.

The investigative journalist exposed the company's foul business practices.