How to Use "foul" with Example Sentences

1. Ability to get to the foul line and make free throws ?
2. Even then , there were rumors of murder most foul .
3. The foul air in the cinema disgusts me .
4. Tens of thousands of chinese are reckoned to die each year because of foul air .
5. But raising fish in such close quarters can contribute to the spread of disease among the animals , and wastes may foul the waters .