- so offensive to the senses as to cause disgust; stinking; loathsome: a foul odor
- extremely dirty or impure; disgustingly filthy
- full of or blocked up with dirt or foreign objects: a foul pipe
- putrid; rotten: said of food
- not decent; obscene; profane: foul language
- very wicked; abominable: a foul murder
- not clear; stormy; unfavorable: foul weather, winds, etc.
- tangled or snarled; caught: a foul rope
- not according to the rules of a game; unfair, by either accident or intention
- treacherous; dishonest
- Chiefly Brit., Now Dial. ugly
- Informal unpleasant, disagreeable, etc.
- ☆ Baseball of or having to do with the part of the field that lies outside the foul lines
- Printing containing errors or marked with changes: foul copy or proof
ME < OE ful, akin to Ger faul, rotten, lazy < IE base *pū-, *pu-, to stink (< ? exclamation of disgust) > L putere, to rot, Gr pyon, pus