| 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 |
| fouled | (adjective) made dirty or foul | Synonyms: befouled |
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| (adjective) especially of a ship's lines etc | Synonyms: afoul, foul |
| found | (adjective) come upon unexpectedly or after searching | - |
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| four | (adjective) being one more than three | Synonyms: 4, iv |
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| fourfold | (adjective) having four units or components | Synonyms: four-fold, quadruple, quadruplex, quadruplicate |
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| (adjective) four times as great or many | Synonyms: four-fold, quadruple |
| fourhanded | (adjective) (of card games) involving or requiring four players | - |
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| fourpenny | (adjective) used of nail size; 1 1/2 in or 3.8 cm long | - |
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| fourscore | (adjective) being ten more than seventy | Synonyms: 80, eighty, lxxx |
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| foursquare | (adjective) characterized by firm and unwavering conviction | - |
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| fourteen | (adjective) being one more than thirteen | Synonyms: 14, xiv |
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| fourteenth | (adjective) coming next after the thirteenth in position | Synonyms: 14th |
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| fourth | (adjective) coming next after the third and just before the fifth in position or time or degree or magnitude | Synonyms: 4th, quaternary |
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