| frontal | (adjective) of or relating to the front of an advancing mass of air | - |
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| (adjective) meeting front to front | Synonyms: head-on |
| (adjective) belonging to the front part | - |
| (adjective) of or adjacent to the forehead or frontal bone | - |
| (noun) an adornment worn on the forehead | Synonyms: frontlet |
| (noun) a drapery that covers the front of an altar | - |
| (noun) the face or front of a building | Synonyms: facade, frontage |
| frontally | (adverb) in, at, or toward the front | - |
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| frontbencher | (noun) a member of the House of Commons who is a minister in the government or who holds an official position in an opposition party | - |
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| frontier | (noun) an undeveloped field of study; a topic inviting research and development | - |
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| (noun) a wilderness at the edge of a settled area of a country | - |
| (noun) an international boundary or the area (often fortified) immediately inside the boundary | - |
| frontiersman | (noun) a man who lives on the frontier | Synonyms: backwoodsman, mountain man |
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| frontierswoman | (noun) a woman who lives on the frontier | - |
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| frontispiece | (noun) front illustration facing the title page of a book | - |
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| (noun) an ornamental facade | - |
| frontlet | (noun) an adornment worn on the forehead | Synonyms: frontal |
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| frontmost | (adjective) preceding all others in spatial position | Synonyms: foremost |
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| frontstall | (noun) medieval plate armor to protect a horse's head | Synonyms: chamfron, chanfron, front-stall, testiere |
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| frontward | (adverb) at or to or toward the front; forward | Synonyms: forrad, forrard, forward, forwards, frontwards |
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| frontwards | (adverb) at or to or toward the front; forward | Synonyms: forrad, forrard, forward, forwards, frontward |
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| frore | (adjective) very cold | - |
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| frost | (noun) weather cold enough to cause freezing | Synonyms: freeze |
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| (noun) the formation of frost or ice on a surface | Synonyms: icing |
| (noun) ice crystals forming a white deposit (especially on objects outside) | Synonyms: hoar, hoarfrost, rime |
| (verb) damage by frost | - |
| (verb) decorate with frosting | Synonyms: ice |
| (verb) provide with a rough or speckled surface or appearance | - |
| (verb) cover with frost | - |
| frostbite | (noun) destruction of tissue by freezing and characterized by tingling, blistering and possibly gangrene | Synonyms: cryopathy |
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| frostbitten | (adjective) injured by freezing or partial freezing | - |
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| frosted | (adjective) (of glass) having a roughened coating resembling frost | - |
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| frostily | (adverb) without warmth or enthusiasm | Synonyms: frigidly |
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| frostiness | (noun) coldness as evidenced by frost | - |
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| (noun) a silvery-white color | Synonyms: hoariness |
| frosting | (noun) a flavored sugar topping used to coat and decorate cakes | Synonyms: ice, icing |
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| frostweed | (noun) perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts | Synonyms: Crocanthemum canadense, frost-weed, frostwort, Helianthemum canadense |
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| (noun) tall perennial herb having clusters of white flowers; the eastern United States | Synonyms: frost-weed, Verbesina virginica, Virginia crownbeard |
| frostwort | (noun) perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts | Synonyms: Crocanthemum canadense, frost-weed, frostweed, Helianthemum canadense |
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| frosty | (adjective) devoid of warmth and cordiality; expressive of unfriendliness or disdain | Synonyms: frigid, frozen, glacial, icy, wintry |
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| (adjective) pleasantly cold and invigorating | Synonyms: crisp, nipping, nippy, snappy |
| (adjective) covered with frost | Synonyms: rimed, rimy |
| froth | (noun) a mass of small bubbles formed in or on a liquid | Synonyms: foam |
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| (verb) exude or expel foam | - |
| (verb) become bubbly or frothy or foaming | Synonyms: effervesce, fizz, foam, form bubbles, sparkle |
| (verb) make froth or foam and become bubbly | Synonyms: spume, suds |
| frothily | (adverb) in a frothy manner | - |
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| frothiness | (noun) the property of giving off bubbles | Synonyms: bubbliness, effervescence |
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| frothing | (adjective) producing or covered with lathery sweat or saliva from exhaustion or disease | Synonyms: foaming, foamy |
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| frothy | (adjective) emitting or filled with bubbles as from carbonation or fermentation | Synonyms: bubbling, bubbly, effervescing, foaming, foamy, spumy |
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| (adjective) marked by high spirits or excitement | Synonyms: bubbling, effervescent, scintillating, sparkly |
| frottage | (noun) masturbation by rubbing against another person (as in a crowd) | - |
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| frotteur | (noun) someone who masturbates by rubbing against another person (as in a crowd) | - |
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| froward | (adjective) habitually disposed to disobedience and opposition | Synonyms: headstrong, self-willed, wilful, willful |
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| frown | (noun) a facial expression of dislike or displeasure | Synonyms: scowl |
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| (verb) look angry or sullen, wrinkle one's forehead, as if to signal disapproval | Synonyms: glower, lour, lower |
| frowning | (adjective) showing displeasure or anger | - |
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| frowningly | (adverb) with a frown; while frowning | - |
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| frowsty | (adjective) stale and unclean smelling | Synonyms: fusty, musty |
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| frowsy | (adjective) negligent of neatness especially in dress and person; habitually dirty and unkempt | Synonyms: frowzy, slovenly |
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| frowzled | (adjective) in disarray; extremely disorderly | Synonyms: disheveled, dishevelled, rumpled, tousled |
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| frowzy | (adjective) negligent of neatness especially in dress and person; habitually dirty and unkempt | Synonyms: frowsy, slovenly |
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| frozen | (adjective) turned into ice; affected by freezing or by long and severe cold | - |
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| (adjective) devoid of warmth and cordiality; expressive of unfriendliness or disdain | Synonyms: frigid, frosty, glacial, icy, wintry |
| (adjective) not convertible to cash | - |
| (adjective) absolutely still | Synonyms: rooted, stock-still |
| (adjective) (used of foods) preserved by freezing sufficiently rapidly to retain flavor and nutritional value | Synonyms: flash-frozen, quick-frozen |
| (adjective) incapable of being changed or moved or undone; e.g. "frozen prices" | Synonyms: fixed |
| (adjective) not thawed | - |
| fructification | (noun) organs of fruiting (especially the reproductive parts of ferns and mosses) | - |
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| (noun) the bearing of fruit | - |
| fructify | (verb) produce fruit | Synonyms: set |
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| (verb) become productive or fruitful | - |
| (verb) make productive or fruitful | - |
| fructose | (noun) a simple sugar found in honey and in many ripe fruits | Synonyms: fruit sugar, laevulose, levulose |
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| fructosuria | (noun) the presence of levulose is the urine | - |
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| frugal | (adjective) avoiding waste | Synonyms: economical, scotch, sparing, stinting |
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| frugality | (noun) prudence in avoiding waste | Synonyms: frugalness |
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| frugally | (adverb) in a frugal manner | - |
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| frugalness | (noun) prudence in avoiding waste | Synonyms: frugality |
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| fruit | (noun) an amount of a product | Synonyms: yield |
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| (noun) the consequence of some effort or action | - |
| (noun) the ripened reproductive body of a seed plant | - |
| (verb) bear fruit | - |
| (verb) cause to bear fruit | - |
| fruitage | (noun) the yield of fruit | - |
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| fruitcake | (noun) a rich cake containing dried fruit and nuts and citrus peel and so on | - |
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| (noun) a whimsically eccentric person | Synonyms: crackpot, crank, nut, nut case, screwball |
| fruiterer | (noun) a person who sells fruit | - |
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| fruitful | (adjective) productive or conducive to producing in abundance | - |
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| fruitfully | (adverb) in a productive way | Synonyms: productively, profitably |
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| fruitfulness | (noun) the quality of something that causes or assists healthy growth | Synonyms: fecundity |
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| (noun) the intellectual productivity of a creative imagination | Synonyms: fecundity |
| fruiting | (adjective) capable of bearing fruit | - |
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| fruition | (noun) something that is made real or concrete | Synonyms: realisation, realization |
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| (noun) enjoyment derived from use or possession | - |
| (noun) the condition of bearing fruit | - |
| fruitless | (adjective) unproductive of success | Synonyms: bootless, futile, sleeveless, vain |
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| fruitlessly | (adverb) in an unproductive manner | Synonyms: unproductively, unprofitably |
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| fruitlessness | (noun) the quality of yielding nothing of value | Synonyms: aridity, barrenness |
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| (noun) a lack of creative imagination | - |
| fruitlet | (noun) a diminutive fruit, especially one that is part of a multiple fruit | - |
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| fruitwood | (noun) wood of various fruit trees (as apple or cherry or pear) used especially in cabinetwork | - |
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| fruity | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
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| (adjective) tasting or smelling richly of or as of fruit | - |
| frumenty | (noun) sweet spiced porridge made from hulled wheat | - |
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| frump | (noun) a dull unattractive unpleasant girl or woman | Synonyms: dog |
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| frumpily | (adverb) in a dowdy unfashionable manner | Synonyms: dowdily, frumpishly |
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| frumpish | (adjective) primly out of date | Synonyms: dowdy, frumpy |
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| frumpishly | (adverb) in a dowdy unfashionable manner | Synonyms: dowdily, frumpily |
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| frumpy | (adjective) primly out of date | Synonyms: dowdy, frumpish |
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| frustrate | (verb) treat cruelly | Synonyms: bedevil, crucify, dun, rag, torment |
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| (verb) hinder or prevent (the efforts, plans, or desires) of | Synonyms: baffle, bilk, cross, foil, queer, scotch, spoil, thwart |
| frustrated | (adjective) disappointingly unsuccessful | Synonyms: defeated, disappointed, discomfited, foiled, thwarted |
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| frustrating | (adjective) discouraging by hindering | - |
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| (adjective) preventing realization or attainment of a desire | Synonyms: frustrative, thwarting |
| frustration | (noun) an act of hindering someone's plans or efforts | Synonyms: foiling, thwarting |
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| (noun) the feeling that accompanies an experience of being thwarted in attaining your goals | Synonyms: defeat |
| (noun) a feeling of annoyance at being hindered or criticized | - |
| frustrative | (adjective) preventing realization or attainment of a desire | Synonyms: frustrating, thwarting |
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| frustum | (noun) a truncated cone or pyramid; the part that is left when a cone or pyramid is cut by a plane parallel to the base and the apical part is removed | - |
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| fruticose | (adjective) of or relating to or resembling a shrub | Synonyms: fruticulose, shrubby |
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| fruticulose | (adjective) of or relating to or resembling a shrub | Synonyms: fruticose, shrubby |
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| fry | (noun) a young person of either sex | Synonyms: child, kid, minor, nestling, nipper, shaver, small fry, tiddler, tike, tyke, youngster |
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| (verb) cook in hot fat or oil | - |
| (verb) kill by electrocution, as in the electric chair | Synonyms: electrocute |
| (verb) be excessively hot | - |
| fryer | (noun) A kitchen appliance for deep frying; its size depends on intended use. | Synonyms: deep fat fryer, deep fryer, frier, fryolator |
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| (noun) flesh of a medium-sized young chicken suitable for frying | Synonyms: frier, pullet |
| frying | (noun) cooking in fat or oil in a pan or griddle | Synonyms: sauteing |
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| fryolator | (noun) A kitchen appliance for deep frying; its size depends on intended use. | Synonyms: deep fat fryer, deep fryer, frier, fryer |
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| frypan | (noun) a pan used for frying foods | Synonyms: frying pan, skillet |
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| gallimaufry | (noun) a motley assortment of things | Synonyms: farrago, hodgepodge, hotchpotch, melange, mingle-mangle, mishmash, oddments, odds and ends, omnium-gatherum, ragbag |
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| germfree | (adjective) free from germs or pathogenic organisms; sterile | - |
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| girlfriend | (noun) a girl or young woman with whom a man is romantically involved | Synonyms: girl, lady friend |
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| (noun) any female friend | - |
| grapefruit | (noun) large yellow fruit with somewhat acid juicy pulp; usual serving consists of a half | - |
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| (noun) citrus tree bearing large round edible fruit having a thick yellow rind and juicy somewhat acid pulp | Synonyms: Citrus paradisi |
| hoarfrost | (noun) ice crystals forming a white deposit (especially on objects outside) | Synonyms: frost, hoar, rime |
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| infra | (adverb) (in writing) at a later place | Synonyms: below |
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| infract | (verb) act in disregard of laws, rules, contracts, or promises | Synonyms: breach, break, go against, offend, transgress, violate |
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| infraction | (noun) a crime less serious than a felony | Synonyms: infringement, misdemeanor, misdemeanour, violation |
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| infrahuman | (adjective) belonging to a group below humans in evolutionary development | - |
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| inframaxillary | (adjective) relating to the lower jaw | Synonyms: mandibular |
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| infrangible | (adjective) not capable of being violated or infringed | Synonyms: absolute, inviolable |
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| (adjective) difficult or impossible to break or separate into parts | - |
| infrared | (adjective) having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end | - |
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| (noun) the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range | Synonyms: infrared frequency |
| (noun) electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves | Synonyms: infrared emission, infrared light, infrared radiation |
| infrasonic | (adjective) having frequencies below those of audible sound | - |
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| infrastructure | (noun) the stock of basic facilities and capital equipment needed for the functioning of a country or area | Synonyms: base |
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| (noun) the basic structure or features of a system or organization | Synonyms: substructure |
| infrequency | (noun) noteworthy scarcity | Synonyms: rareness, rarity |
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| infrequent | (adjective) not frequent; not occurring regularly or at short intervals | - |
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| infrequently | (adverb) not many times | - |
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| infrigidation | (noun) the process of cooling or freezing (e.g., food) for preservative purposes | Synonyms: refrigeration |
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| infringe | (verb) advance beyond the usual limit | Synonyms: encroach, impinge |
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| (verb) go against, as of rules and laws | Synonyms: conflict, contravene, run afoul |