Adjective : a foul smell. ,foul air; foul stagnant water. ,a foul gas jet. ,foul weather. ,foul language. ,a foul blow. ,a foul anchor.    From Dictionary.com. 

Adverb : It looked like a homer when he hit it, but it went foul.    From Dictionary.com. 

Noun : a foul between two racing sculls. ,The referee called it a foul.    From Dictionary.com. 

Verb (used with object) : His reputation had been fouled by unfounded accusations. ,He fouled off two curves before being struck out on a fastball.    From Dictionary.com. 

Verb (used without object) : The rope fouled.    From Dictionary.com.