| 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 |
| foulard | (noun) a light plain-weave or twill-weave silk or silklike fabric (usually with a printed design) | - |
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| fouled | (adjective) made dirty or foul | Synonyms: befouled |
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| (adjective) especially of a ship's lines etc | Synonyms: afoul, foul |
| foully | (adverb) in a wicked and shameful manner | - |
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| (adverb) in an unfair and insulting manner | Synonyms: insultingly |
| foulmart | (noun) dark brown mustelid of woodlands of Eurasia that gives off an unpleasant odor when threatened | Synonyms: fitch, foumart, Mustela putorius, polecat |
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| foulness | (noun) the attribute of having a strong offensive smell | Synonyms: fetidness, malodorousness, rankness, stinkiness |
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| (noun) (of weather) the badness of the weather | Synonyms: raininess |
| (noun) a state characterized by foul or disgusting dirt and refuse | Synonyms: filth, filthiness, nastiness |
| (noun) disgusting wickedness and immorality | - |
| foumart | (noun) dark brown mustelid of woodlands of Eurasia that gives off an unpleasant odor when threatened | Synonyms: fitch, foulmart, Mustela putorius, polecat |
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| found | (adjective) come upon unexpectedly or after searching | - |
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| (noun) food and lodging provided in addition to money | - |
| (verb) use as a basis for; found on | Synonyms: base, establish, ground |
| (verb) set up or lay the groundwork for | Synonyms: constitute, establish, institute, plant |
| (verb) set up or found | Synonyms: establish, launch, set up |
| foundation | (noun) the act of starting something for the first time; introducing something new | Synonyms: creation, founding, initiation, innovation, instauration, institution, introduction, origination |
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| (noun) lowest support of a structure | Synonyms: base, foot, fundament, groundwork, substructure, understructure |
| (noun) a woman's undergarment worn to give shape to the contours of the body | Synonyms: foundation garment |
| (noun) the fundamental assumptions from which something is begun or developed or calculated or explained | Synonyms: base, basis, cornerstone, fundament, groundwork |
| (noun) education or instruction in the fundamentals of a field of knowledge | Synonyms: grounding |
| (noun) an institution supported by an endowment | - |
| (noun) the basis on which something is grounded | - |
| founder | (noun) a person who founds or establishes some institution | Synonyms: beginner, father, founding father |
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| (noun) a worker who makes metal castings | - |
| (noun) inflammation of the laminated tissue that attaches the hoof to the foot of a horse | Synonyms: laminitis |
| (verb) break down, literally or metaphorically | Synonyms: break, cave in, collapse, fall in, give, give way |
| (verb) sink below the surface | - |
| (verb) stumble and nearly fall | - |
| (verb) fail utterly; collapse | Synonyms: fall flat, fall through, flop |
| foundering | (noun) (of a ship) sinking | Synonyms: going under |
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| founding | (noun) the act of starting something for the first time; introducing something new | Synonyms: creation, foundation, initiation, innovation, instauration, institution, introduction, origination |
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| foundling | (noun) a child who has been abandoned and whose parents are unknown | Synonyms: abandoned infant |
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| foundress | (noun) a woman founder | - |
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| foundry | (noun) factory where metal castings are produced | Synonyms: metalworks |
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| fount | (noun) a plumbing fixture that provides a flow of water | Synonyms: fountain |
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| (noun) a specific size and style of type within a type family | Synonyms: case, face, font, typeface |
| fountain | (noun) a plumbing fixture that provides a flow of water | Synonyms: fount |
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| (noun) an artificially produced flow of water | Synonyms: jet |
| (noun) a structure from which an artificially produced jet of water arises | - |
| (noun) a natural flow of ground water | Synonyms: natural spring, outflow, outpouring, spring |
| fountainhead | (noun) an abundant source | Synonyms: well, wellspring |
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| (noun) the source of water from which a stream arises | Synonyms: head, headspring |
| four | (adjective) being one more than three | Synonyms: 4, iv |
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| (noun) a playing card or domino or die whose upward face shows four pips | Synonyms: four-spot |
| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, foursome, IV, Little Joe, quadruplet, quartet, quatern, quaternary, quaternion, quaternity, tetrad |
| 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 |
| (adverb) by a factor of four | Synonyms: four times |
| fourhanded | (adjective) (of card games) involving or requiring four players | - |
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| fourpence | (noun) a former English silver coin worth four pennies | Synonyms: groat |
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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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| (noun) the cardinal number that is the product of ten and eight | Synonyms: 80, eighty, LXXX |
| foursome | (noun) four people considered as a unit | Synonyms: quartet, quartette |
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| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, IV, Little Joe, quadruplet, quartet, quatern, quaternary, quaternion, quaternity, tetrad |
| foursquare | (adjective) characterized by firm and unwavering conviction | - |
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| (noun) (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon | Synonyms: square |
| (adverb) with firmness and conviction; without compromise | Synonyms: squarely, straightforwardly |
| (adverb) in a square position | - |
| fourteen | (adjective) being one more than thirteen | Synonyms: 14, xiv |
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| (noun) the cardinal number that is the sum of thirteen and one | Synonyms: 14, XIV |
| fourteenth | (adjective) coming next after the thirteenth in position | Synonyms: 14th |
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| (noun) position 14 in a countable series of things | - |
| 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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| (noun) the musical interval between one note and another four notes away from it | - |
| (noun) one of four equal parts | Synonyms: fourth part, one-fourth, one-quarter, quarter, quartern, twenty-five percent |
| (noun) following the third position; number four in a countable series | - |
| (adverb) in the fourth place | Synonyms: fourthly |
| fourthly | (adverb) in the fourth place | Synonyms: fourth |
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