| faithful | (adjective) steadfast in affection or allegiance | - |
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| (adjective) not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend | - |
| (adjective) marked by fidelity to an original | Synonyms: close |
| (noun) a group of people who adhere to a common faith and habitually attend a given church | Synonyms: congregation, fold |
| (noun) any loyal and steadfast following | - |
| faithfully | (adverb) in a faithful manner | Synonyms: dependably, reliably |
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| faithfulness | (noun) the quality of being faithful | Synonyms: fidelity |
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| famulus | (noun) a close attendant (as to a scholar) | - |
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| fanciful | (adjective) indulging in or influenced by fancy | Synonyms: notional |
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| (adjective) having a curiously intricate quality | - |
| (adjective) not based on fact; existing only in the imagination | Synonyms: imaginary, notional |
| fancifully | (adverb) in a fanciful manner | Synonyms: whimsically |
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| fantabulous | (adjective) very good; of the highest quality | Synonyms: excellent, first-class, mean, ripping, splendid |
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| fasciculation | (noun) muscular twitching of contiguous groups of muscle fibers | - |
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| fascicule | (noun) an installment of a printed work | Synonyms: fascicle |
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| fasciculus | (noun) a bundle of fibers (especially nerve fibers) | Synonyms: fascicle, fiber bundle, fibre bundle |
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| fateful | (adjective) having momentous consequences; of decisive importance | Synonyms: fatal |
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| (adjective) controlled or decreed by fate; predetermined | Synonyms: fatal |
| (adjective) ominously prophetic | Synonyms: foreboding, portentous |
| (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: black, calamitous, disastrous, fatal |
| fatefully | (adverb) in a prophetically fateful manner | - |
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| fauld | (noun) a piece of armor plate below the breastplate | - |
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| fault | (noun) a wrong action attributable to bad judgment or ignorance or inattention | Synonyms: error, mistake |
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| (noun) (sports) a serve that is illegal (e.g., that lands outside the prescribed area) | - |
| (noun) the quality of being inadequate or falling short of perfection | Synonyms: demerit |
| (noun) responsibility for a bad situation or event | - |
| (noun) (electronics) equipment failure attributable to some defect in a circuit (loose connection or insulation failure or short circuit etc.) | - |
| (noun) (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other | Synonyms: break, faulting, fracture, geological fault, shift |
| (noun) an imperfection in an object or machine | Synonyms: defect, flaw |
| (verb) put or pin the blame on | Synonyms: blame |
| faultfinder | (noun) someone who is critical of the motives of others | Synonyms: cynic |
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| faultfinding | (adjective) tending to find and call attention to faults | Synonyms: captious |
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| (adjective) tending to make moral judgments or judgments based on personal opinions | - |
| (noun) persistent petty and unjustified criticism | Synonyms: carping |
| faultily | (adverb) in a mistaken manner | - |
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| faultiness | (noun) the state of being defective | Synonyms: defectiveness |
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| faulting | (noun) (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other | Synonyms: break, fault, fracture, geological fault, shift |
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| faultless | (adjective) without fault or error | Synonyms: immaculate, impeccable, incorrupted |
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| faultlessly | (adverb) without a fault; in a faultless manner | - |
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| faultlessness | (noun) the quality of being without an error or fault | Synonyms: impeccability |
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| faulty | (adjective) having a defect | Synonyms: defective |
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| (adjective) characterized by errors; not agreeing with a model or not following established rules | Synonyms: incorrect, wrong |
| fearful | (adjective) lacking courage; ignobly timid and faint-hearted | Synonyms: cowardly |
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| (adjective) experiencing or showing fear | - |
| (adjective) causing fear or dread or terror | Synonyms: awful, dire, direful, dread, dreaded, dreadful, fearsome, frightening, horrendous, horrific, terrible |
| (adjective) extremely distressing | Synonyms: frightful |
| (adjective) timid by nature or revealing timidity | Synonyms: timorous, trepid |
| fearfully | (adverb) in fear | - |
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| (adverb) in an alarming manner | - |
| fearfulness | (noun) the trait of being afraid | - |
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| (noun) an emotion experienced in anticipation of some specific pain or danger (usually accompanied by a desire to flee or fight) | Synonyms: fear, fright |
| fecula | (noun) excreta (especially of insects) | - |
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| feculence | (noun) something that is feculent | - |
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| feculent | (adjective) foul with waste matter | - |
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| ferrule | (noun) a metal cap or band placed on a wooden pole to prevent splitting | Synonyms: collet |
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| ferule | (noun) a switch (a stick or cane or flat paddle) used to punish children | - |
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| fibula | (noun) the outer and thinner of the two bones of the human leg between the knee and ankle | Synonyms: calf bone |
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| fistful | (noun) the quantity that can be held in the hand | Synonyms: handful |
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| fistula | (noun) an abnormal passage leading from a suppurating cavity to the body surface | Synonyms: sinus |
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| (noun) a chronic inflammation of the withers of a horse | Synonyms: fistulous withers |
| fistular | (adjective) hollow and tube-shaped like a reed | Synonyms: fistulate, fistulous |
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| fistulate | (adjective) hollow and tube-shaped like a reed | Synonyms: fistular, fistulous |
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| fistulous | (adjective) of or pertaining to or resembling a fistula | - |
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| (adjective) hollow and tube-shaped like a reed | Synonyms: fistular, fistulate |
| fitful | (adjective) intermittently stopping and starting | Synonyms: interrupted, off-and-on |
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| (adjective) occurring in spells and often abruptly | Synonyms: spasmodic |
| fitfully | (adverb) in a fitful manner | - |
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| fitfulness | (noun) the quality of being spasmodic and irregular | Synonyms: jerkiness |
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| flashbulb | (noun) a lamp for providing momentary light to take a photograph | Synonyms: flash, flash bulb, flash lamp, flashgun, photoflash |
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| flaskful | (noun) the quantity a flask will hold | Synonyms: flask |
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| flatulence | (noun) pompously embellished language | Synonyms: turgidity, turgidness |
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| (noun) a state of excessive gas in the alimentary canal | Synonyms: flatulency, gas |
| flatulency | (noun) a state of excessive gas in the alimentary canal | Synonyms: flatulence, gas |
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| flatulent | (adjective) generating excessive gas in the alimentary canal | - |
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| (adjective) suffering from excessive gas in the alimentary canal | Synonyms: colicky, gassy |
| flavorful | (adjective) full of flavor | Synonyms: flavorous, flavorsome, flavourful, flavourous, flavoursome, sapid, saporous |
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| flavourful | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavorsome, flavourous, flavoursome, sapid, saporous |
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| flocculate | (verb) form into an aggregated lumpy or fluffy mass | - |
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| (verb) cause to become a fluffy or lumpy aggregate | - |
| flocculation | (noun) the process of flocculating; forming woolly cloudlike aggregations | - |
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| flocculator | (noun) An apparatus used in the process of flocculation. | - |
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| floccule | (noun) a small loosely aggregated mass of flocculent material suspended in or precipitated from a liquid | Synonyms: floc |
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| flocculent | (adjective) having a fluffy character or appearance | Synonyms: woolly, wooly |
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| floricultural | (adjective) of or relating to or involving floriculture | - |
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| floriculture | (noun) the cultivation of flowering plants | Synonyms: flower gardening |
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| follicular | (adjective) of or relating to or constituting a follicle | - |
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| folliculitis | (noun) inflammation of a hair follicle | - |
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| footfault | (noun) a fault that occurs when the server in tennis fails to keep both feet behind the baseline | - |
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| forceful | (adjective) characterized by or full of force or strength (often but not necessarily physical) | - |
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| (adjective) forceful and definite in expression or action | Synonyms: emphatic |
| forcefully | (adverb) with full force | - |
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| forcefulness | (noun) physical energy or intensity | Synonyms: force, strength |
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| foresightful | (adjective) planning prudently for the future | Synonyms: farseeing, farsighted, foresighted, long, longsighted, prospicient |
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| foresightfulness | (noun) providence by virtue of planning prudently for the future | Synonyms: foresight, foresightedness |
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| forethoughtful | (adjective) thoughtful of the future | - |
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| forgetful | (adjective) (of memory) deficient in retentiveness or range | Synonyms: short, unretentive |
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| (adjective) not mindful or attentive | Synonyms: mindless, unmindful |
| (adjective) failing to keep in mind | Synonyms: oblivious |
| forgetfully | (adverb) in a forgetful manner | - |
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| forgetfulness | (noun) tendency to forget | - |
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| (noun) unawareness caused by neglectful or heedless failure to remember | - |
| formula | (noun) something regarded as a normative example | Synonyms: convention, normal, pattern, rule |
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| (noun) (mathematics) a standard procedure for solving a class of mathematical problems | Synonyms: rule |
| (noun) a group of symbols that make a mathematical statement | Synonyms: expression |
| (noun) a conventionalized statement expressing some fundamental principle | - |
| (noun) directions for making something | Synonyms: recipe |
| (noun) a representation of a substance using symbols for its constituent elements | Synonyms: chemical formula |
| (noun) a liquid food for infants | - |
| formulaic | (adjective) characterized by or in accordance with some formula | - |
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| formularise | (verb) express as a formula | Synonyms: formularize |
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| formularize | (verb) express as a formula | Synonyms: formularise |
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| formulary | (adjective) of or relating to or of the nature of a formula | - |
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| (noun) (pharmacology) a book containing a compilation of pharmaceutical products with their formulas and methods of preparation | Synonyms: pharmacopeia |
| formulate | (verb) put into words or an expression | Synonyms: articulate, give voice, phrase, word |
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| (verb) elaborate, as of theories and hypotheses | Synonyms: develop, explicate |
| (verb) come up with (an idea, plan, explanation, theory, or principle) after a mental effort | Synonyms: contrive, devise, excogitate, forge, invent |
| (verb) prepare according to a formula | - |
| formulated | (adjective) devised; developed according to an orderly plan | - |
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| formulation | (noun) inventing or contriving an idea or explanation and formulating it mentally | Synonyms: conceptualisation, conceptualization |
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| (noun) the style of expressing yourself | Synonyms: expression |
| (noun) a substance prepared according to a formula | Synonyms: preparation |
| 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 | - |
| fraudulence | (noun) something intended to deceive; deliberate trickery intended to gain an advantage | Synonyms: dupery, fraud, hoax, humbug, put-on |
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| (noun) the quality of being fraudulent | Synonyms: deceit |
| (noun) a fraudulent or duplicitous representation | Synonyms: duplicity |
| fraudulent | (adjective) involving deception | Synonyms: deceitful, fallacious |
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| fraudulently | (adverb) in a dishonest and fraudulent manner | - |
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| fretful | (adjective) habitually complaining | Synonyms: querulous, whiney, whiny |
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| (adjective) nervous and unable to relax | Synonyms: antsy, fidgety, itchy, restless |
| fretfully | (adverb) in a fretful manner | - |
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| fretfulness | (noun) an irritable petulant feeling | Synonyms: choler, crossness, fussiness, irritability, peevishness, petulance |
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| frightful | (adjective) provoking horror | Synonyms: atrocious, horrible, horrifying, ugly |
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| (adjective) extremely distressing | Synonyms: fearful |
| (adjective) extreme in degree or extent or amount or impact | Synonyms: awful, terrible, tremendous |
| frightfully | (adverb) used as intensifiers | Synonyms: awful, awfully, terribly |
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| frightfulness | (noun) the quality of being frightful | - |
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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 |
| fruticulose | (adjective) of or relating to or resembling a shrub | Synonyms: fruticose, shrubby |
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| fulcrum | (noun) the pivot about which a lever turns | - |
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| fulfil | (verb) fill, satisfy or meet a want or need or condition or restriction | Synonyms: conform to, fill, fit, fulfill, meet, satisfy |
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| (verb) put in effect | Synonyms: accomplish, action, carry out, carry through, execute, fulfill |
| (verb) meet the requirements or expectations of | Synonyms: fulfill, live up to, satisfy |
| fulfill | (verb) fill, satisfy or meet a want or need or condition or restriction | Synonyms: conform to, fill, fit, fulfil, meet, satisfy |
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| (verb) put in effect | Synonyms: accomplish, action, carry out, carry through, execute, fulfil |
| (verb) meet the requirements or expectations of | Synonyms: fulfil, live up to, satisfy |
| fulfilled | (adjective) completed to perfection | - |
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| fulfillment | (noun) the act of consummating something (a desire or promise etc) | Synonyms: fulfilment |
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| (noun) a feeling of satisfaction at having achieved your desires | Synonyms: fulfilment |
| fulfilment | (noun) the act of consummating something (a desire or promise etc) | Synonyms: fulfillment |
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| (noun) a feeling of satisfaction at having achieved your desires | Synonyms: fulfillment |
| fulgent | (adjective) shining intensely | Synonyms: blazing, blinding, dazzling, glaring, glary |
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