| biblical | (adjective) of or pertaining to or contained in or in accordance with the Bible | Synonyms: scriptural |
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| (adjective) in keeping with the nature of the Bible or its times or people | - |
| bibliographical | (adjective) relating to or dealing with bibliography | Synonyms: bibliographic |
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| bibliomaniacal | (adjective) characteristic of or characterized by or noted for bibliomania | - |
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| bibliothecal | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecarial |
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| bibliothecarial | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecal |
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| bicameral | (adjective) composed of two legislative bodies | - |
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| (adjective) consisting of two chambers | Synonyms: two-chambered |
| bicentennial | (adjective) of or relating to or completing a period of 200 years | Synonyms: bicentenary |
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| (noun) the 200th anniversary (or the celebration of it) | Synonyms: bicentenary |
| bicipital | (adjective) having two heads or points of origin as a biceps | - |
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| bicylindrical | (adjective) having two cylindrical surfaces usually with parallel axes | - |
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| bidirectional | (adjective) reactive or functioning or allowing movement in two usually opposite directions | - |
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| biennial | (adjective) having a life cycle lasting two seasons | Synonyms: two-year |
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| (adjective) occurring every second year | Synonyms: biyearly |
| (noun) (botany) a plant having a life cycle that normally takes two seasons from germination to death to complete; flowering biennials usually bloom and fruit in the second season | - |
| bifacial | (adjective) having two faces or fronts | Synonyms: biface |
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| bifocal | (adjective) having two foci | - |
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| bigeminal | (adjective) occurring in pairs | - |
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| bilabial | (adjective) of or relating to or being a speech sound that is articulated using both lips | - |
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| (noun) a consonant that is articulated using both lips; /p/ or /b/ or /w/ | - |
| bilateral | (adjective) having two sides or parts | Synonyms: two-sided |
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| (adjective) affecting or undertaken by two parties | - |
| (adjective) having identical parts on each side of an axis | Synonyms: bilaterally symmetric, bilaterally symmetrical, isobilateral |
| bilingual | (adjective) using or knowing two languages | - |
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| (noun) a person who speaks two languages fluently | Synonyms: bilingualist |
| bill | (noun) the entertainment offered at a public presentation | - |
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| (noun) horny projecting mouth of a bird | Synonyms: beak, neb, nib, pecker |
| (noun) a brim that projects to the front to shade the eyes | Synonyms: eyeshade, peak, visor, vizor |
| (noun) a cutting tool with a sharp edge | Synonyms: billhook |
| (noun) a sign posted in a public place as an advertisement | Synonyms: card, notice, placard, poster, posting |
| (noun) an itemized statement of money owed for goods shipped or services rendered | Synonyms: account, invoice |
| (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: broadsheet, broadside, circular, flier, flyer, handbill, throwaway |
| (noun) a statute in draft before it becomes law | Synonyms: measure |
| (noun) a list of particulars (as a playbill or bill of fare) | - |
| (noun) a piece of paper money (especially one issued by a central bank) | Synonyms: bank bill, bank note, banker's bill, banknote, Federal Reserve note, government note, greenback, note |
| (verb) advertise especially by posters or placards | - |
| (verb) publicize or announce by placards | Synonyms: placard |
| (verb) demand payment | Synonyms: charge |
| bimanual | (adjective) requiring two hands or designed for two people | Synonyms: two-handed |
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| bimestrial | (adjective) two months long; lasting two months | - |
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| (adjective) occurring every two months | Synonyms: bimonthly |
| bimetal | (adjective) formed of two different metals or alloys; especially in sheets bonded together | Synonyms: bimetallic |
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| (noun) material made by bonding together sheets of two different metals | - |
| bimillenial | (adjective) of or relating to a bimillennium | - |
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| bimodal | (adjective) of a distribution; having or occurring with two modes | - |
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| binaural | (adjective) relating to or having or hearing with two ears | Synonyms: biaural |
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| binful | (noun) the quantity contained in a bin | Synonyms: bin |
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| binomial | (adjective) of or relating to or consisting of two terms | - |
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| (adjective) having or characterized by two names, especially those of genus and species in taxonomies | Synonyms: binominal |
| (noun) (mathematics) a quantity expressed as a sum or difference of two terms; a polynomial with two terms | - |
| binominal | (adjective) having or characterized by two names, especially those of genus and species in taxonomies | Synonyms: binomial |
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| biochemical | (adjective) of or relating to biochemistry; involving chemical processes in living organisms | - |
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| biogeographical | (adjective) of or relating to or involved with biogeography | Synonyms: biogeographic |
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| biographical | (adjective) of or relating to or being biography | Synonyms: biographic |
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| biological | (adjective) (of a parent or child) related by blood; genetically related | Synonyms: natural |
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| (adjective) pertaining to biology or to life and living things | Synonyms: biologic |
| biomedical | (adjective) relating to the activities and applications of science to clinical medicine | - |
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| bionomical | (adjective) of or relating to the science of ecology | Synonyms: bionomic, ecologic, ecological |
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| bipedal | (adjective) having two feet | Synonyms: biped, two-footed |
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| biracial | (adjective) consisting of or combining two races | - |
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| biradial | (adjective) showing both bilateral and radial symmetry | - |
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| birdcall | (noun) a device for imitating a birdcall | - |
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| (noun) the characteristic sound produced by a bird | Synonyms: birdsong, call, song |
| birl | (verb) cause to spin | Synonyms: spin, twirl, whirl |
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| (verb) cause a floating log to rotate by treading | Synonyms: birle |
| bisectional | (adjective) of or relating to bisection | - |
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| bisexual | (adjective) sexually attracted to both sexes | - |
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| (adjective) having an ambiguous sexual identity | Synonyms: epicene |
| (noun) a person who is sexually attracted to both sexes | Synonyms: bisexual person |
| bismuthal | (adjective) of or relating to bismuth | - |
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| bizonal | (adjective) relating to or concerned with the combined affairs of two administrative zones | - |
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| blackball | (noun) the act of excluding someone by a negative vote or veto | Synonyms: barring |
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| (verb) expel from a community or group | Synonyms: ban, banish, cast out, ostracise, ostracize, shun |
| (verb) vote against; refuse to endorse; refuse to assent | Synonyms: negative, veto |
| blackmail | (noun) extortion of money by threats to divulge discrediting information | - |
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| (verb) obtain through threats | - |
| (verb) exert pressure on someone through threats | Synonyms: blackjack, pressure |
| blackpoll | (noun) North American warbler having a black-and-white head | Synonyms: Dendroica striate |
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| blacktail | (noun) mule deer of western Rocky Mountains | Synonyms: black-tailed deer, blacktail deer, Odocoileus hemionus columbianus |
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| blameful | (adjective) deserving blame or censure as being wrong or evil or injurious | Synonyms: blamable, blameable, blameworthy, censurable, culpable |
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| blastemal | (adjective) of or relating to blastemata | Synonyms: blastematic, blastemic |
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| blastocoel | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocele, blastocoele, cleavage cavity, segmentation cavity |
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| blastoporal | (adjective) of or relating to a blastopore | Synonyms: blastoporic |
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| blissful | (adjective) completely happy and contented | - |
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| blowball | (noun) any of several herbs of the genus Taraxacum having long tap roots and deeply notched leaves and bright yellow flowers followed by fluffy seed balls | Synonyms: dandelion |
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| bluebell | (noun) one of the most handsome prairie wildflowers having large erect bell-shaped bluish flowers; of moist places in prairies and fields from eastern Colorado and Nebraska south to New Mexico and Texas | Synonyms: Eustoma grandiflorum, prairie gentian, tulip gentian |
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| (noun) perennial of Northern Hemisphere with slender stems and bell-shaped blue flowers | Synonyms: Campanula rotundifolia, harebell |
| (noun) sometimes placed in genus Scilla | Synonyms: harebell, Hyacinthoides nonscripta, Scilla nonscripta, wild hyacinth, wood hyacinth |
| bluebill | (noun) diving ducks of North America having a bluish-grey bill | Synonyms: broadbill, scaup, scaup duck |
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| bluegill | (noun) important edible sunfish of eastern and central United States | Synonyms: Lepomis macrochirus |
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| blushful | (adjective) of blush color | Synonyms: rosy |
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| (adjective) having a red face from embarrassment or shame or agitation or emotional upset | Synonyms: blushing, red-faced |
| boastful | (adjective) exhibiting self-importance | Synonyms: big, braggart, bragging, braggy, cock-a-hoop, crowing, self-aggrandising, self-aggrandizing |
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| boatbill | (noun) tropical American heron related to night herons | Synonyms: boat-billed heron, broadbill, Cochlearius cochlearius |
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| bobtail | (adjective) having a short or shortened tail | Synonyms: bobtailed |
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| (noun) a short or shortened tail of certain animals | Synonyms: bob, dock |
| (noun) large sheepdog with a profuse shaggy bluish-grey-and-white coat and short tail; believed to trace back to the Roman occupation of Britain | Synonyms: Old English sheepdog |
| boil | (noun) the temperature at which a liquid boils at sea level | Synonyms: boiling point |
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| (noun) a painful sore with a hard core filled with pus | Synonyms: furuncle |
| (verb) immerse or be immersed in a boiling liquid, often for cooking purposes | - |
| (verb) come to the boiling point and change from a liquid to vapor | - |
| (verb) bring to, or maintain at, the boiling point | - |
| (verb) be in an agitated emotional state | Synonyms: seethe |
| (verb) be agitated | Synonyms: churn, moil, roil |
| boll | (noun) the rounded seed-bearing capsule of a cotton or flax plant | - |
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| bombshell | (noun) an explosive bomb or artillery shell | - |
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| (noun) a shocking surprise | Synonyms: thunderbolt, thunderclap |
| (noun) an entertainer who has a sensational effect | - |
| bonemeal | (noun) fertilizer made of ground bones | - |
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| bookstall | (noun) a shop where books are sold | Synonyms: bookshop, bookstore |
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| boreal | (adjective) toward or located in the north | - |
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| (adjective) relating to or marked by qualities associated with the north wind | - |
| (adjective) comprising or throughout far northern regions | Synonyms: circumboreal |
| borstal | (noun) formerly a British reform school for youths considered too young to send to prison | - |
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| botanical | (adjective) of or relating to plants or botany | Synonyms: botanic |
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| (noun) a drug made from part of a plant (as the bark or root or leaves) | - |
| botryoidal | (adjective) resembling a cluster of grapes in form | Synonyms: botryoid, boytrose |
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| bottleful | (noun) the quantity contained in a bottle | Synonyms: bottle |
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| botulinal | (adjective) of or relating to or produced by the botulinus | - |
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| bountiful | (adjective) producing in abundance | Synonyms: plentiful |
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| (adjective) given or giving freely | Synonyms: big, bighearted, bounteous, freehanded, giving, handsome, liberal, openhanded |
| bowel | (noun) the part of the alimentary canal between the stomach and the anus | Synonyms: gut, intestine |
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| bowl | (noun) the act of rolling something (as the ball in bowling) | Synonyms: roll |
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| (noun) a dish that is round and open at the top for serving foods | - |
| (noun) a round vessel that is open at the top; used chiefly for holding grains or liquids | - |
| (noun) a small round container that is open at the top for holding tobacco | Synonyms: pipe bowl |
| (noun) a large structure for open-air sports or entertainments | Synonyms: arena, sports stadium, stadium |
| (noun) a wooden ball (with flattened sides so that it rolls on a curved course) used in the game of lawn bowling | - |
| (noun) a large ball with finger holes used in the sport of bowling | Synonyms: bowling ball |
| (noun) the quantity contained in a bowl | Synonyms: bowlful |
| (noun) a concave shape with an open top | Synonyms: trough |
| (verb) engage in the sport of bowling | - |
| (verb) hurl a cricket ball from one end of the pitch towards the batsman at the other end | - |
| (verb) roll (a ball) | - |
| bowlful | (noun) the quantity contained in a bowl | Synonyms: bowl |
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| boxful | (noun) the quantity contained in a box | Synonyms: box |
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| brachial | (adjective) of or relating to an arm | - |
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| brachycranial | (adjective) having a short broad head with a cephalic index of over 80 | Synonyms: brachycephalic, brachycranic |
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| bracteal | (adjective) pertaining to or resembling or functioning as a bract | - |
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| bradawl | (noun) an awl for making small holes for brads or small screws | Synonyms: pricker |
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| brahminical | (adjective) of or relating to or characteristic of a brahmin | Synonyms: brahminic |
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| brail | (noun) a small rope (one of several) used to draw a sail in | - |
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| (noun) a small net used to draw fish into a boat | - |
| (verb) haul fish aboard with brails | - |
| (verb) take in a sail with a brail | - |
| branchial | (adjective) of or relating to gills (or to parts of the body derived from embryonic gills) | - |
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| brandyball | (noun) a British candy flavored with brandy | - |
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| brawl | (noun) a noisy fight in a crowd | Synonyms: free-for-all |
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| (noun) an uproarious party | Synonyms: bash, do |
| (verb) to quarrel noisily, angrily or disruptively | Synonyms: wrangle |
| brazil | (noun) three-sided tropical American nut with white oily meat and hard brown shell | Synonyms: brazil nut |
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| bridal | (adjective) of or pertaining to a bride | - |
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| (adjective) of or relating to a wedding | Synonyms: nuptial, spousal |
| (noun) archaic terms for a wedding or wedding feast | Synonyms: espousal |
| brill | (noun) European food fish | Synonyms: Scophthalmus rhombus |
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| brimful | (adjective) filled up | Synonyms: brimfull, brimming |
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| brimfull | (adjective) filled up | Synonyms: brimful, brimming |
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| brinjal | (noun) hairy upright herb native to southeastern Asia but widely cultivated for its large glossy edible fruit commonly used as a vegetable | Synonyms: aubergine, eggplant, eggplant bush, garden egg, mad apple, Solanum melongena |
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| bristletail | (noun) small wingless insect with a long bristlelike tail | - |
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| broadbill | (noun) small birds of the Old World tropics having bright plumage and short wide bills | - |
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| (noun) freshwater duck of the Northern Hemisphere having a broad flat bill | Synonyms: Anas clypeata, shoveler, shoveller |
| (noun) diving ducks of North America having a bluish-grey bill | Synonyms: bluebill, scaup, scaup duck |
| (noun) tropical American heron related to night herons | Synonyms: boat-billed heron, boatbill, Cochlearius cochlearius |
| broadtail | (noun) hardy coarse-haired sheep of central Asia; lambs are valued for their soft curly black fur | Synonyms: caracul, karakul |
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| (noun) the fur of a very young karakul lamb | - |
| broil | (noun) cooking by direct exposure to radiant heat (as over a fire or under a grill) | Synonyms: broiling, grilling |
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| (verb) cook under a broiler | Synonyms: oven broil |
| (verb) heat by a natural force | Synonyms: bake |
| (verb) be very hot, due to hot weather or exposure to the sun | Synonyms: bake |
| bromoil | (noun) a print made by the bromoil process having soft, paint-like qualities. | - |
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| bronchial | (adjective) relating to or associated with the bronchi | - |
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| brothel | (noun) a building where prostitutes are available | Synonyms: bagnio, bawdyhouse, bordello, cathouse, house of ill repute, house of prostitution, sporting house, whorehouse |
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| browntail | (noun) small brown and white European moth introduced into eastern United States; pest of various shade and fruit trees | Synonyms: brown-tail moth, Euproctis phaeorrhoea |
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| brumal | (adjective) characteristic of or relating to winter | Synonyms: hibernal, hiemal |
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| brutal | (adjective) disagreeably direct and precise | - |
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| (adjective) resembling a beast; showing lack of human sensibility | Synonyms: beastly, bestial, brute, brutish |
| (adjective) punishingly harsh | Synonyms: unrelenting |
| (adjective) (of persons or their actions) able or disposed to inflict pain or suffering | Synonyms: barbarous, cruel, fell, roughshod, savage, vicious |