| afoul | (adjective) especially of a ship's lines etc | Synonyms: foul, fouled |
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| befoul | (verb) spot, stain, or pollute | Synonyms: defile, foul, maculate |
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| foul | (adjective) (of a baseball) not hit between the foul lines | - |
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| (adjective) disgustingly dirty; filled or smeared with offensive matter | Synonyms: filthy, nasty |
| (adjective) characterized by obscenity | Synonyms: cruddy, filthy, nasty, smutty |
| (adjective) (of a manuscript) defaced with changes | Synonyms: dirty, marked-up |
| (adjective) offensively malodorous | Synonyms: fetid, foetid, foul-smelling, funky, ill-scented, noisome, smelly, stinking |
| (adjective) highly offensive; arousing aversion or disgust | Synonyms: disgustful, disgusting, distasteful, loathly, loathsome, repellant, repellent, repelling, revolting, skanky, wicked, yucky |
| (adjective) especially of a ship's lines etc | Synonyms: afoul, fouled |
| (adjective) violating accepted standards or rules | Synonyms: cheating, dirty, unsporting, unsportsmanlike |
| (noun) an act that violates the rules of a sport | - |
| (verb) become soiled and dirty | - |
| (verb) make unclean | - |
| (verb) spot, stain, or pollute | Synonyms: befoul, defile, maculate |
| (verb) make impure | Synonyms: contaminate, pollute |
| (verb) commit a foul; break the rules | - |
| (verb) hit a foul ball | - |
| (verb) become or cause to become obstructed | Synonyms: back up, choke, choke off, clog, clog up, congest, crap up |