| roughness | (noun) harsh or severe speech or behavior | - |
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| (noun) a texture of a surface or edge that is not smooth but is irregular and uneven | Synonyms: raggedness |
| (noun) the quality of being harsh or rough or grating to the senses | Synonyms: harshness |
| (noun) an unpolished unrefined quality | Synonyms: crudeness |
| (noun) the formation of small pits in a surface as a consequence of corrosion | Synonyms: indentation, pitting |
| (noun) used of the sea during inclement or stormy weather | Synonyms: choppiness, rough water |
| (noun) rowdy behavior | Synonyms: disorderliness, rowdiness, rowdyism |
| roughrider | (noun) a horseman skilled at breaking wild horses to the saddle | - |
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| roulade | (noun) (music) an elaborate run of several notes sung to one syllable | - |
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| (noun) a dish consisting of a slice of meat that is rolled around a filling and cooked | - |
| rouleau | (noun) a roll of coins wrapped in paper | - |
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| (noun) a roll of ribbon | - |
| roulette | (noun) a gambling game in which players bet on which compartment of a revolving wheel a small ball will come to rest in | - |
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| (noun) a wheel with teeth for making a row of perforations | Synonyms: toothed wheel |
| (noun) a line generated by a point on one figure rolling around a second figure | Synonyms: line roulette |
| round | (noun) (often plural) a series of professional calls (usually in a set order) | - |
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| (noun) the usual activities in your day | Synonyms: daily round |
| (noun) the activity of playing 18 holes of golf | Synonyms: round of golf |
| (noun) any circular or rotating mechanism | Synonyms: circle |
| (noun) a charge of ammunition for a single shot | Synonyms: one shot, unit of ammunition |
| (noun) a crosspiece between the legs of a chair | Synonyms: rung, stave |
| (noun) a partsong in which voices follow each other; one voice starts and others join in one after another until all are singing different parts of the song at the same time | Synonyms: troll |
| (noun) an outburst of applause | - |
| (noun) a cut of beef between the rump and the lower leg | - |
| (noun) a serving to each of a group (usually alcoholic) | Synonyms: round of drinks |
| (noun) a regular route for a sentry or policeman | Synonyms: beat |
| (noun) the course along which communications spread | - |
| (noun) (sports) a division of a game during which one team is on the offensive | Synonyms: bout, turn |
| (noun) an interval during which a recurring sequence of events occurs | Synonyms: cycle, rhythm |
| roundabout | (noun) a road junction at which traffic streams circularly around a central island | Synonyms: circle, rotary, traffic circle |
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| (noun) a large, rotating machine with seats for children to ride on for amusement | Synonyms: carousel, carrousel, merry-go-round, whirligig |
| roundedness | (noun) the property possessed by a rounded convexity | Synonyms: bulginess |
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| roundel | (noun) round piece of armor plate that protects the armpit | - |
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| (noun) (heraldry) a charge in the shape of a filled circle | - |
| (noun) English form of rondeau having three triplets with a refrain after the first and third | - |
| roundelay | (noun) a song in which a line or phrase is repeated as the refrain | - |
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| rounder | (noun) a tool for rounding corners or edges | - |
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| (noun) a dissolute person; usually a man who is morally unrestrained | Synonyms: debauchee, libertine |
| rounders | (noun) an English ball game similar to baseball | - |
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| roundhead | (noun) a brachycephalic person | - |
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| roundhouse | (noun) a hook delivered with an exaggerated swing | - |
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| (noun) workplace consisting of a circular building for repairing locomotives | - |
| rounding | (noun) (mathematics) a miscalculation that results from rounding off numbers to a convenient number of decimals | Synonyms: rounding error |
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| roundness | (noun) the property possessed by a line or surface that is curved and not angular | - |
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| (noun) the bodily property of being well rounded | Synonyms: embonpoint, plumpness |
| (noun) the quality of being round numbers | - |
| (noun) the fullness of a tone of voice | Synonyms: rotundity |
| roundsman | (noun) a workman employed to make rounds (to deliver goods or make inspections or so on) | - |
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| roundtable | (noun) a meeting of peers for discussion and exchange of views | Synonyms: round-table conference, round table |
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| roundup | (noun) the systematic gathering up of suspects by the police | - |
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| (noun) the activity of gathering livestock together so that they can be counted or branded or sold | - |
| (noun) a summary list; as in e.g. "a news roundup" | - |
| roundworm | (noun) unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic | Synonyms: nematode, nematode worm |
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| (noun) infections of the skin or nails caused by fungi and appearing as itching circular patches | Synonyms: ringworm, tinea |
| rouser | (noun) someone who rouses others from sleep | Synonyms: arouser, waker |
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| rousing | (noun) the act of arousing | Synonyms: arousal |
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| roustabout | (noun) a member of a ship's crew who performs manual labor | Synonyms: deckhand |
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| rout | (noun) an overwhelming defeat | - |
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| (noun) a disorderly crowd of people | Synonyms: mob, rabble |
| route | (noun) an open way (generally public) for travel or transportation | Synonyms: road |
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| (noun) an established line of travel or access | Synonyms: itinerary, path |
| routemarch | (noun) a long training march for troops | - |
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| router | (noun) (computer science) a device that forwards data packets between computer networks | - |
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| (noun) a worker who routes shipments for distribution and delivery | - |
| (noun) a power tool with a shaped cutter; used in carpentry for cutting grooves | - |
| routine | (noun) an unvarying or habitual method or procedure | Synonyms: modus operandi |
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| (noun) a set sequence of steps, part of larger computer program | Synonyms: function, procedure, subprogram, subroutine |
| (noun) a short performance that is part of a longer program | Synonyms: act, bit, number, turn |
| routineness | (noun) The state or quality of being routine, of possessing the traits of being quotidian, and repeating a pattern regularly. | - |
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| roux | (noun) a mixture of fat and flour heated and used as a basis for sauces | - |
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| sandgrouse | (noun) pigeon-like bird of arid regions of the Old World having long pointed wings and tail and precocial downy young | Synonyms: sand grouse |
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| scrounger | (noun) someone who mooches or cadges (tries to get something free) | Synonyms: cadger, mooch, moocher |
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| shroud | (noun) burial garment in which a corpse is wrapped | Synonyms: cerement, pall, winding-clothes, winding-sheet |
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| (noun) (nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind | Synonyms: mainsheet, sheet, tack, weather sheet |
| (noun) a line that suspends the harness from the canopy of a parachute | - |
| slanderousness | (noun) The property of being both untrue and harmful to a reputation. | - |
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| sonorousness | (noun) having the character of a loud deep sound; the quality of being resonant | Synonyms: plangency, resonance, reverberance, ringing, sonority, vibrancy |
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| sprout | (noun) a newly grown bud (especially from a germinating seed) | - |
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| (noun) any new growth of a plant such as a new branch or a bud | - |
| sprouter | (noun) A device for sprouting seeds. | Synonyms: seed sprouter |
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| sprouting | (noun) the process whereby seeds or spores sprout and begin to grow | Synonyms: germination |
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| subgroup | (noun) (mathematics) a subset (that is not empty) of a mathematical group | - |
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| (noun) a distinct and often subordinate group within a group | - |
| subroutine | (noun) a set sequence of steps, part of larger computer program | Synonyms: function, procedure, routine, subprogram |
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| surround | (noun) the area in which something exists or lives | Synonyms: environment, environs, surroundings |
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| surroundings | (noun) the area in which something exists or lives | Synonyms: environment, environs, surround |
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| (noun) the environmental condition | Synonyms: milieu |
| thoroughbred | (noun) a pedigreed animal of unmixed lineage; used especially of horses | Synonyms: pureblood, purebred |
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| (noun) a racehorse belonging to a breed that originated from a cross between Arabian stallions and English mares | - |
| (noun) a well-bred person | - |
| thoroughfare | (noun) a public road from one place to another | - |
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| thoroughness | (noun) conscientiousness in performing all aspects of a task | - |
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| (noun) property of being marked by full detail, complete in all respects. | - |
| thoroughwort | (noun) perennial herb of southeastern United States having white-rayed flower heads; formerly used as in folk medicine | Synonyms: agueweed, boneset, Eupatorium perfoliatum |
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| throughput | (noun) output relative to input; the amount passing through a system from input to output (especially of a computer program over a period of time) | - |
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| throughway | (noun) a broad highway designed for high-speed traffic | Synonyms: expressway, freeway, motorway, pike, state highway, superhighway, thruway |
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| thunderousness | (noun) The state or condition of being very loud, suggestive of thunder; booming loudness. | - |
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| timorousness | (noun) fearfulness in venturing into new and unknown places or activities | Synonyms: timidity |
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| (noun) fear of the unknown or unfamiliar or fear of making decisions | Synonyms: timidity, timidness |
| traitorousness | (noun) disloyalty by virtue of subversive behavior | Synonyms: subversiveness, treason |
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| treacherousness | (noun) The characteristic of providing insecure footing or support; of being marked by hidden dangers, hazards, or perils. | - |
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| troubadour | (noun) a singer of folk songs | Synonyms: folk singer, jongleur, minstrel, poet-singer |
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| trouble | (noun) an effort that is inconvenient | Synonyms: difficulty |
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| (noun) a source of difficulty | Synonyms: problem |
| (noun) an event causing distress or pain | - |
| (noun) an angry disturbance | Synonyms: bother, fuss, hassle |
| (noun) a strong feeling of anxiety | Synonyms: worry |
| (noun) an unwanted pregnancy | - |
| troublemaker | (noun) someone who deliberately stirs up trouble | Synonyms: bad hat, mischief-maker, trouble maker, troubler |
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| troubler | (noun) someone who deliberately stirs up trouble | Synonyms: bad hat, mischief-maker, trouble maker, troublemaker |
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| troubleshooter | (noun) a worker whose job is to locate and fix sources of trouble (especially in mechanical devices) | Synonyms: trouble shooter |
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| troublesomeness | (noun) a difficulty that causes anxiety | Synonyms: inconvenience, worriment |
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| trough | (noun) a channel along the eaves or on the roof; collects and carries away rainwater | Synonyms: gutter |
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| (noun) a container (usually in a barn or stable) from which cattle or horses feed | Synonyms: manger |
| (noun) a long narrow shallow receptacle | - |
| (noun) a narrow depression (as in the earth or between ocean waves or in the ocean bed) | - |
| (noun) a treasury for government funds | Synonyms: public treasury, till |
| (noun) a concave shape with an open top | Synonyms: bowl |
| trouncing | (noun) the act of inflicting corporal punishment with repeated blows | Synonyms: beating, drubbing, lacing, licking, thrashing, whacking |
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| (noun) a sound defeat | Synonyms: debacle, drubbing, slaughter, thrashing, walloping, whipping |
| troupe | (noun) organization of performers and associated personnel (especially theatrical) | Synonyms: company |
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| trouper | (noun) an actor who travels around the country presenting plays | Synonyms: barnstormer, play-actor, playactor |
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| (noun) a person who is reliable and uncomplaining and hard working | - |
| trouser | (noun) a garment (or part of a garment) designed for or relating to trousers | - |
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| trousering | (noun) any fabric used to make trousers | Synonyms: panting |
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| trousers | (noun) (usually in the plural) a garment extending from the waist to the knee or ankle, covering each leg separately | Synonyms: pair of trousers, pant |
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| trousseau | (noun) the personal outfit of a bride; clothes and accessories and linens | - |
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| trout | (noun) any of various game and food fishes of cool fresh waters mostly smaller than typical salmons | - |
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| (noun) flesh of any of several primarily freshwater game and food fishes | - |
| turnaround | (noun) turning in the opposite direction | Synonyms: reversal, reverse, reversion, turnabout |
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| (noun) act or process of unloading and loading and servicing a vessel or aircraft for a return trip | Synonyms: turnround |
| (noun) an area sufficiently large for a vehicle to turn around | - |
| (noun) a decision to reverse an earlier decision | Synonyms: change of mind, flip-flop, reversal, turnabout |
| (noun) time need to prepare a vessel or ship for a return trip | Synonyms: turnaround time |
| turnround | (noun) act or process of unloading and loading and servicing a vessel or aircraft for a return trip | Synonyms: turnaround |
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| underground | (noun) an electric railway operating below the surface of the ground (usually in a city) | Synonyms: metro, subway, subway system, tube |
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| (noun) a secret group organized to overthrow a government or occupation force | Synonyms: resistance |
| untroublesomeness | (noun) The property of not giving trouble or anxiety. | - |
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| valorousness | (noun) the qualities of a hero or heroine; exceptional or heroic courage when facing danger (especially in battle) | Synonyms: gallantry, heroism, valiance, valiancy, valor, valour |
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| vaporousness | (noun) cloudiness resulting from haze or mist or vapor | Synonyms: haziness, mistiness, steaminess, vapourousness |
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| vapourousness | (noun) cloudiness resulting from haze or mist or vapor | Synonyms: haziness, mistiness, steaminess, vaporousness |
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| wraparound | (noun) a garment (as a dress or coat) with a full length opening; adjusts to the body by wrapping around | - |
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