| k | (adjective) denoting a quantity consisting of 1,000 items or units | Synonyms: 1000, m, one thousand, thousand |
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| kabbalistic | (adjective) having a secret or hidden meaning | Synonyms: cabalistic, cryptic, cryptical, qabalistic, sibylline |
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| kafkaesque | (adjective) characterized by surreal distortion and a sense of impending danger | - |
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| kaleidoscopic | (adjective) continually shifting or rapidly changing | Synonyms: kaleidoscopical |
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| kaleidoscopical | (adjective) continually shifting or rapidly changing | Synonyms: kaleidoscopic |
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| kaput | (adjective) destroyed or killed | Synonyms: done for, gone |
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| karyokinetic | (adjective) of or relating to the division of the nucleus of a cell during mitosis or meiosis | - |
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| katabatic | (adjective) of an air current or wind; moving downward or down a slope because of cooling especially at night | Synonyms: catabatic |
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| katabolic | (adjective) characterized by destructive metabolism | Synonyms: catabolic |
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| (adjective) relating to or characterized by catabolism | Synonyms: catabolic |
| katharobic | (adjective) of living being in an oxygenated environment lacking organic matter | - |
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| kayoed | (adjective) knocked unconscious by a heavy blow | Synonyms: knocked out, KO'd, out, stunned |
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| keeled | (adjective) having a ridge or shaped like a ridge or suggesting the keel of a ship | Synonyms: carinate, carinated, ridged |
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| keen | (adjective) excellent | Synonyms: bang-up, bully, corking, cracking, dandy, great, groovy, neat, nifty, not bad, old, peachy, slap-up, smashing, swell |
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| (adjective) intense or sharp | Synonyms: exquisite |
| (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: acute, discriminating, incisive, knifelike, penetrating, penetrative, piercing, sharp |
| (adjective) having a sharp cutting edge or point | - |
| (adjective) painful as if caused by a sharp instrument | Synonyms: cutting, knifelike, lancinate, lancinating, piercing, stabbing |
| kempt | (adjective) (of hair) neat and tidy | Synonyms: tidy |
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| kept | (adjective) (especially of promises or contracts) not violated or disregarded | Synonyms: unbroken |
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| key | (adjective) serving as an essential component | Synonyms: cardinal, central, fundamental, primal |
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| keyed | (adjective) fitted with or secured by a key | - |
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| (adjective) set to a key or tone | - |
| keyless | (adjective) lacking or not requiring a key | - |
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| khaki | (adjective) of a yellowish brown color | - |
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| killable | (adjective) fit to kill, especially for food | - |
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| killing | (adjective) very funny | Synonyms: sidesplitting |
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| kin | (adjective) related by blood | Synonyms: akin, blood-related, cognate, consanguine, consanguineal, consanguineous |
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| kinaesthetic | (adjective) of or relating to kinesthesis | Synonyms: kinesthetic |
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| kind | (adjective) having or showing a tender and considerate and helpful nature; used especially of persons and their behavior | - |
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| (adjective) tolerant and forgiving under provocation | Synonyms: tolerant |
| (adjective) agreeable, conducive to comfort | Synonyms: genial |
| kindhearted | (adjective) having or proceeding from an innately kind disposition | Synonyms: kind-hearted |
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| kindled | (adjective) set afire | Synonyms: enkindled, ignited |
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| kindly | (adjective) pleasant and agreeable | - |
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| (adjective) showing or motivated by sympathy and understanding and generosity | Synonyms: benevolent, charitable, good-hearted, large-hearted, openhearted, sympathetic |
| kindred | (adjective) related by blood or marriage | - |
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| (adjective) similar in quality or character | Synonyms: akin |
| kinesthetic | (adjective) of or relating to kinesthesis | Synonyms: kinaesthetic |
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| kinetic | (adjective) relating to the motion of material bodies and the forces associated therewith | - |
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| (adjective) supplying motive force | Synonyms: energising, energizing |
| (adjective) characterized by motion | - |
| kinglike | (adjective) having the rank of or resembling or befitting a king | Synonyms: kingly |
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| kingly | (adjective) having the rank of or resembling or befitting a king | Synonyms: kinglike |
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| kinky | (adjective) (used of sexual behavior) showing or appealing to bizarre or deviant tastes | Synonyms: perverted |
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| (adjective) (of hair) in small tight curls | Synonyms: crisp, frizzly, frizzy, nappy |
| (adjective) (informal) strikingly unconventional | Synonyms: far-out, offbeat, quirky, way-out |
| kitschy | (adjective) effusively or insincerely emotional | Synonyms: bathetic, drippy, hokey, maudlin, mawkish, mushy, sappy, schmaltzy, schmalzy, sentimental, slushy, soppy, soupy |
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| kittenish | (adjective) playful like a lively kitten | Synonyms: frisky |
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| knackered | (adjective) extremely exhausted | Synonyms: drained |
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| knavish | (adjective) marked by skill in deception | Synonyms: crafty, cunning, dodgy, foxy, guileful, slick, sly, tricksy, tricky, wily |
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| knifelike | (adjective) having a sharp or distinct edge | - |
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| (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: acute, discriminating, incisive, keen, penetrating, penetrative, piercing, sharp |
| (adjective) cutting or able to cut as if with a knife | - |
| (adjective) painful as if caused by a sharp instrument | Synonyms: cutting, keen, lancinate, lancinating, piercing, stabbing |
| knightly | (adjective) being attentive to women like an ideal knight | Synonyms: chivalrous, gallant |
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| (adjective) characteristic of the time of chivalry and knighthood in the Middle Ages | Synonyms: chivalric, mediaeval, medieval |
| knitted | (adjective) made by intertwining threads in a series of connected loops rather than by weaving | - |
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| knobbed | (adjective) used of old persons or old trees; covered with knobs or knots | Synonyms: gnarled, gnarly, knotted, knotty |
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| knobbly | (adjective) having knobs | Synonyms: knobby |
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| knobby | (adjective) having knobs | Synonyms: knobbly |
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| knockabout | (adjective) suitable for rough use | - |
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| (adjective) full of rough and exuberant animal spirits | Synonyms: boisterous |
| knockdown | (adjective) (furniture) easily assembled and dismantled | - |
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| knockout | (adjective) very strong or vigorous | Synonyms: hard, severe |
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| knotted | (adjective) used of old persons or old trees; covered with knobs or knots | Synonyms: gnarled, gnarly, knobbed, knotty |
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| (adjective) tied with a knot | - |
| knotty | (adjective) highly complex or intricate and occasionally devious | Synonyms: Byzantine, convoluted, involved, labyrinthine, tangled, tortuous |
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| (adjective) used of old persons or old trees; covered with knobs or knots | Synonyms: gnarled, gnarly, knobbed, knotted |
| (adjective) making great mental demands; hard to comprehend or solve or believe | Synonyms: baffling, elusive, problematic, problematical, tough |
| (adjective) tangled in knots or snarls | Synonyms: snarled, snarly |
| knowable | (adjective) capable of being known | Synonyms: cognisable, cognizable, cognoscible |
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| knowing | (adjective) highly educated; having extensive information or understanding | Synonyms: knowledgeable, learned, lettered, well-educated, well-read |
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| (adjective) evidencing the possession of inside information | Synonyms: wise, wise to |
| (adjective) characterized by conscious design or purpose | Synonyms: deliberate, intentional |
| (adjective) alert and fully informed | Synonyms: knowledgeable |
| knowledgeable | (adjective) highly educated; having extensive information or understanding | Synonyms: knowing, learned, lettered, well-educated, well-read |
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| (adjective) thoroughly acquainted through study or experience | Synonyms: intimate, versed |
| (adjective) alert and fully informed | Synonyms: knowing |
| known | (adjective) apprehended with certainty | - |
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| kookie | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
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| kooky | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kookie, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
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| kosher | (adjective) conforming to Jewish dietary laws | Synonyms: cosher |
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| (adjective) proper or legitimate | - |
| kyphotic | (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookback, crookbacked, gibbous, humpbacked, humped, hunchbacked |
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