| fractionize | v. | to divide into fractions | ||
| fractious | adj. | unruly; quarrelsome | ||
| franklin | n. | freeholder of land in 14th–15th centuries, ranking just below the gentry | ||
| frass | n. | insect excrement | ||
| fraught | adj. | laden, filled | ||
| fray | n. | fight, brawl | ||
| freeboard | n. | distance between waterline and topmost waterproof deck on a ship | ||
| fremescent | adj. | murmuring, increasingly noisy | ||
| fremitus | n. | palpable bodily vibration | ||
| French leave | n. | unannounced or surreptitious departure, absence without authorization | ||
| fret | v. | to gnaw; to wear away by gnawing, friction, corrosion, etc. | ||
| friable | adj. | easily broken into powder or crumbled, crumbly | ||
| fribble | v. | to act aimlessly; to trifle, to behave frivolously; a trifler | ||
| frieze | n. | coarse woolen cloth napped on one side only | ||
| frighten the horses | v. | to upset public standards, to cause moral alarm | idiom | |
| fritinancy | n. | twittering (also fritiniancy, fritiniency) | ||
| frivol | v. | to act in a silly manner | ||
| frog | n. | belt attachment for carrying sword, bayonet, hatchet, or machete | ||
| frontlet | n. | decorative ornament worn on forehead; phylactery | ||
| frore | adj. | frozen, extremely cold | archaic | |
| frot | v. | to rub, to chafe, to stroke; [tanning] to make supple by rubbing | ||
| frounce | n. | pleat or fold (of cloth) | ||
| froward | adj. | contrary, refractory, untoward | ||
| frowsty | adj. | musty, hot and stuffy | ||
| frowzy | adj. | musty, bad smelling; slatternly, unkempt | ||
| fruitive | adj. | fruitful; enjoying, possessing | ||
| fuddle | v. | to confuse; to inebriate; to tipple, to go on a drinking spree | ||
| fug | n. | stale, close air | ||
| fulgent | adj. | shining brightly | ||
| fulgor | n. | lashing and brilliant light, splendor | ||
| full | v. | to clean and thicken cloth | ||
| fuller’s earth | n. | absorbent clay (traditionally a hydrous aluminum silicate) used for removing stains or cleaning oil from cloth or skin, along with many other uses | ||
| fulminant | adj. | developing suddenly | ||
| fulminate | v. | to flash like lightning; to explode; to thunder forth condemnation(s); to inveigh violently | ||
| fulsome | adj. | offensive to good taste; loathsome; excessive; (obsolete) abundant, full | ||
| fulvous | adj. | dull yellowish-brown, tawny | ||
| fumid | adj. | vaporous, having or emitting fumes | ||
| functor | n. | mapping of one category to another in category theory; thingies serving a similar purpose in language (function words) or programming (function objects) | ||
| fungible | adj. | essentially interchangeable, said of products for which any exemplar may be replaced by another of the same good (economics) | ||
| fungo | n. | soft fly ball hit for fielding practice (baseball) | ||
| furbelow | n. | flounce, pleated border of petticoat or skirt; showy trimming | ||
| furfur | n. | dandruff, scurf | ||
| furlong | n. | 220 yards, 1/8 of a mile | ||
| furore | n. | clamorous outbreak or uprising, commotion, to-do, outburst of public excitement or rage | ||
| fussation | n. | act or practice of fussing | ||
| fust | v. | to grow moldy or stale-smelling | ||
| fustian | n. | 1 | bombast, inappropriately lofty language | |
| fustian | n. | 2 | coarse fabric of cotton and flax | |
| futilitarian | n. | someone who believes that hope is useless | ||
| futtock shroud | n. | lines securing platform attached to mast by running below the top to the mast itself | nautical |
