| ascertained | (adjective) discovered or determined by scientific observation | Synonyms: discovered, observed |
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| asinine | (adjective) extremely silly or stupid | Synonyms: fatuous, inane |
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| asparagine | (noun) a crystalline amino acid found in proteins and in many plants (e.g., asparagus) | - |
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| assertiveness | (noun) aggressive self-assurance; given to making bold assertions | Synonyms: self-assertiveness |
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| assiduousness | (noun) great and constant diligence and attention | Synonyms: assiduity, concentration |
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| assigned | (adjective) appointed to a post or duty | - |
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| assignee | (noun) (law) the party to whom something is assigned (e.g., someone to whom a right or property is legally transferred) | - |
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| associableness | (noun) the capability of being easily associated or joined or connected in thought | Synonyms: associability |
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| assuredness | (noun) great coolness and composure under strain | Synonyms: aplomb, cool, poise, sang-froid |
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| astatine | (noun) a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium | Synonyms: At, atomic number 85 |
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| astuteness | (noun) intelligence manifested by being astute (as in business dealings) | Synonyms: perspicaciousness, perspicacity, shrewdness |
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| (noun) the intellectual ability to penetrate deeply into ideas | Synonyms: deepness, depth, profoundness, profundity |
| asynergia | (noun) absence of coordination of organs or body parts that usually work together harmoniously | Synonyms: asynergy |
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| asynergic | (adjective) of or relating to the state of asynergy; lacking synergy | - |
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| asynergy | (noun) absence of coordination of organs or body parts that usually work together harmoniously | Synonyms: asynergia |
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| atheneum | (noun) a place where reading materials are available | Synonyms: athenaeum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: athenaeum |
| atherogenesis | (noun) the formation of atheromas on the walls of the arteries as in atherosclerosis | - |
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| atone | (verb) turn away from sin or do penitence | Synonyms: repent |
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| (verb) make amends for | Synonyms: aby, abye, expiate |
| atonement | (noun) the act of atoning for sin or wrongdoing (especially appeasing a deity) | Synonyms: expiation, propitiation |
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| (noun) compensation for a wrong | Synonyms: expiation, satisfaction |
| atrazine | (noun) a synthetic compound derived from triazine that is widely used as an agricultural herbicide | - |
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| atrociousness | (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrocity, barbarity, barbarousness, heinousness |
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| atropine | (noun) a poisonous crystalline alkaloid extracted from the nightshade family; used as an antispasmodic and to dilate the eye pupil; also administered in large amounts as an antidote for organophosphate nerve agents or organophosphate insecticides | - |
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| attainableness | (noun) the state of being achievable | Synonyms: achievability, attainability |
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| attained | (adjective) achieved or reached | - |
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| attentiveness | (noun) the trait of being considerate and thoughtful of others | - |
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| (noun) the trait of being observant and paying attention | - |
| (noun) paying particular notice (as to children or helpless people) | Synonyms: heed, paying attention, regard |
| attorney | (noun) a professional person authorized to practice law; conducts lawsuits or gives legal advice | Synonyms: lawyer |
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| attorneyship | (noun) the position of attorney | - |
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| attractiveness | (noun) sexual allure | - |
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| (noun) the quality of arousing interest; being attractive or something that attracts | Synonyms: attraction |
| attune | (verb) adjust or accustom to; bring into harmony with | - |
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| aubergine | (noun) egg-shaped vegetable having a shiny skin typically dark purple but occasionally white or yellow | Synonyms: eggplant, mad apple |
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| (noun) hairy upright herb native to southeastern Asia but widely cultivated for its large glossy edible fruit commonly used as a vegetable | Synonyms: brinjal, eggplant, eggplant bush, garden egg, mad apple, Solanum melongena |
| auctioneer | (noun) an agent who conducts an auction | - |
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| (verb) sell at an auction | Synonyms: auction, auction off |
| audaciousness | (noun) fearless daring | Synonyms: audacity, temerity |
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| (noun) aggressive boldness or unmitigated effrontery | Synonyms: audacity |
| audibleness | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibility |
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| auspiciousness | (noun) the favorable quality of strongly indicating a successful result | Synonyms: propitiousness |
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| austereness | (noun) extreme plainness | Synonyms: severeness, severity |
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| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
| autogenesis | (noun) a hypothetical organic phenomenon by which living organisms are created from nonliving matter | Synonyms: abiogenesis, autogeny, spontaneous generation |
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| autogenetic | (adjective) of or relating to autogenesis | - |
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| autoimmune | (adjective) of or relating to the immune response of the body against substance normally present in the body | - |
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| availableness | (noun) the quality of being at hand when needed | Synonyms: accessibility, availability, handiness |
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| avariciousness | (noun) extreme greed for material wealth | Synonyms: avarice, covetousness, cupidity |
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| avellane | (adjective) pertaining to filberts or hazelnuts | Synonyms: avellan |
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| aventurine | (noun) a translucent quartz spangled with bits of mica or other minerals | Synonyms: sunstone |
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| averageness | (noun) ordinariness as a consequence of being average and not outstanding | Synonyms: mediocrity |
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| (noun) the state of being that is average; indicates normality but with connotations of mediocrity | - |
| avidness | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidity, eagerness, keenness |
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| awakened | (adjective) aroused or activated | - |
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| (adjective) (somewhat formal) having been waked up | - |
| awareness | (noun) having knowledge of | Synonyms: cognisance, cognizance, consciousness, knowingness |
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| (noun) state of elementary or undifferentiated consciousness | Synonyms: sentience |
| awayness | (noun) the state of being elsewhere than in particular place | - |
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| awfulness | (noun) a quality of extreme unpleasantness | Synonyms: dreadfulness, horridness, terribleness |
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| awkwardness | (noun) the carriage of someone whose movements and posture are ungainly or inelegant | Synonyms: clumsiness |
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| (noun) the quality of an embarrassing situation | Synonyms: nuisance value |
| (noun) trouble in carrying or managing caused by bulk or shape | Synonyms: cumbersomeness, unwieldiness |
| (noun) the inelegance of someone stiff and unrelaxed (as by embarrassment) | Synonyms: clumsiness, gracelessness, stiffness |
| (noun) unskillfulness resulting from a lack of training | Synonyms: clumsiness, ineptitude, ineptness, maladroitness, slowness |
| awned | (adjective) having awns i.e. bristlelike or hairlike appendages on the flowering parts of some cereals and grasses | Synonyms: awny |
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| axone | (noun) long nerve fiber that conducts away from the cell body of the neuron | Synonyms: axon |
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| azathioprine | (noun) an immunosuppressive drug (trade name Imuran) used to prevent rejection of a transplanted organ | Synonyms: Imuran |
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| backbone | (noun) the part of a network that connects other networks together | - |
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| (noun) the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved | Synonyms: spine |
| (noun) fortitude and determination | Synonyms: grit, gumption, guts, moxie, sand |
| (noun) the series of vertebrae forming the axis of the skeleton and protecting the spinal cord | Synonyms: back, rachis, spinal column, spine, vertebral column |
| (noun) a central cohesive source of support and stability | Synonyms: anchor, keystone, linchpin, lynchpin, mainstay |
| backwardness | (noun) lack of normal development of intellectual capacities | Synonyms: mental retardation, retardation, slowness, subnormality |
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| badness | (noun) that which is below standard or expectations as of ethics or decency | Synonyms: bad |
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| (noun) used of the degree of something undesirable e.g. pain or weather | Synonyms: severeness, severity |
| (noun) an attribute of mischievous children | Synonyms: mischievousness, naughtiness |
| baldness | (noun) the condition of having no hair on the top of the head | Synonyms: phalacrosis |
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| balefulness | (noun) the quality or nature of being harmful or evil | Synonyms: maleficence, mischief |
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| balkiness | (noun) likely to stop abruptly and unexpectedly | - |
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| balkline | (noun) line across a billiard table behind which the cue balls are placed at the start of a game | Synonyms: baulk-line, string line |
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| balletomane | (noun) a ballet enthusiast | - |
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| balminess | (noun) the quality of weather that is deliciously mild and soothing | Synonyms: softness |
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| baloney | (noun) pretentious or silly talk or writing | Synonyms: bilgewater, boloney, bosh, drool, humbug, taradiddle, tarradiddle, tommyrot, tosh, twaddle |
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| bandoneon | (noun) a type of concertina popular in South America | - |
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| bane | (noun) something causing misery or death | Synonyms: curse, nemesis, scourge |
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| baneberry | (noun) a plant of the genus Actaea having acrid poisonous berries | Synonyms: cohosh, herb Christopher |
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| (noun) a poisonous berry of a plant of the genus Actaea | - |
| baneful | (adjective) deadly or sinister | Synonyms: baleful |
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| (adjective) exceedingly harmful | Synonyms: deadly, pernicious, pestilent |
| banefully | (adverb) in a noxiously baneful way | Synonyms: perniciously |
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| banned | (adjective) forbidden by law | Synonyms: prohibited |
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| banner | (adjective) unusually good; outstanding | - |
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| (noun) long strip of cloth or paper used for decoration or advertising | Synonyms: streamer |
| (noun) any distinctive flag | Synonyms: standard |
| (noun) a newspaper headline that runs across the full page | Synonyms: streamer |
| banneret | (noun) a knight honored for valor; entitled to display a square banner and to hold higher command | Synonyms: knight banneret, knight of the square flag |
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| bannerlike | (adverb) like a banner | - |
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| barbarousness | (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, atrocity, barbarity, heinousness |
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| barbitone | (noun) a barbiturate used as a hypnotic | Synonyms: barbital, diethylbarbituric acid, diethylmalonylurea, veronal |
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| bareness | (noun) an extreme lack of furnishings or ornamentation | Synonyms: starkness |
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| (noun) the state of being unclothed and exposed (especially of a part of the body) | - |
| (noun) a bleak and desolate atmosphere | Synonyms: bleakness, desolation, nakedness |
| bargainer | (noun) someone who purchases and maintains an inventory of goods to be sold | Synonyms: dealer, monger, trader |
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| (noun) negotiator of the terms of a transaction | - |
| baritone | (adjective) lower in range than tenor and higher than bass | - |
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| (noun) the second lowest brass wind instrument | Synonyms: baritone horn |
| (noun) the second lowest adult male singing voice | Synonyms: baritone voice |
| (noun) a male singer | Synonyms: barytone |
| barnburner | (noun) an impressively successful event | - |
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| (noun) someone who burns down a barn | - |
| baroness | (noun) a noblewoman who holds the rank of baron or who is the wife or widow of a baron | - |
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| baronet | (noun) a member of the British order of honor; ranks below a baron but above a knight | Synonyms: Bart |
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| baronetage | (noun) the state of a baronet | - |
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| (noun) the collective body of baronets | - |
| baronetcy | (noun) the title of a baron | - |
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| (noun) the rank or dignity or position of a baronet or baroness | Synonyms: barony |
| baronetise | (verb) confer baronetcy upon | Synonyms: baronetize |
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| baronetize | (verb) confer baronetcy upon | Synonyms: baronetise |
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| baroqueness | (noun) elaborate and extensive ornamentation in decorative art and architecture that flourished in Europe in the 17th century | Synonyms: baroque |
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| barrenness | (noun) the quality of yielding nothing of value | Synonyms: aridity, fruitlessness |
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| (noun) the state (usually of a woman) of having no children or being unable to have children | - |
| barytone | (noun) a male singer | Synonyms: baritone |
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| baseline | (noun) the lines a baseball player must follow while running the bases | - |
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| (noun) the back line bounding each end of a tennis or handball court; when serving the server must not step over this line | Synonyms: service line |
| (noun) an imaginary line or standard by which things are measured or compared | - |
| baseness | (noun) unworthiness by virtue of lacking higher values | Synonyms: contemptibility, despicability, despicableness, sordidness |
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| bashfulness | (noun) feeling embarrassed due to modesty | Synonyms: abashment |
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| basined | (adjective) enclosed in a basin | - |
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| basinet | (noun) a medieval steel helmet | - |
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| bassine | (noun) coarse leaf fiber from palmyra palms used in making brushes and brooms | - |
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| bassinet | (noun) a basket (usually hooded) used as a baby's bed | - |
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| (noun) a perambulator that resembles a bassinet | - |
| bastioned | (adjective) secured with bastions or fortifications | Synonyms: fortified |
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| bawdiness | (noun) the trait of behaving in an obscene manner | Synonyms: lewdness, obscenity, salaciousness, salacity |
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| bayonet | (noun) a knife that can be fixed to the end of a rifle and used as a weapon | - |
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| (verb) stab or kill someone with a bayonet | - |
| beaner | (noun) a baseball deliberately thrown at the batter's head | Synonyms: beanball |
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| beardedness | (noun) The quality of having a beard. | - |
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| beastliness | (noun) unpleasant nastiness; used especially of nasty weather | - |
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| (noun) the quality of being deliberately mean | Synonyms: meanness |
| beauteousness | (noun) the quality of being good looking and attractive | Synonyms: comeliness, fairness, loveliness |
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