| acknowledgeable | (adjective) capable of being acknowledged | - |
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| acknowledged | (adjective) recognized or made known or admitted | - |
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| (adjective) generally accepted | - |
| antiknock | (adjective) suppressing or eliminating engine knock in combustion engines | Synonyms: antiknocking |
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| antiknocking | (adjective) suppressing or eliminating engine knock in combustion engines | Synonyms: antiknock |
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| breakneck | (adjective) moving at very high speed | - |
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| cockney | (adjective) characteristic of Cockneys or their dialect | - |
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| hackneyed | (adjective) repeated too often; overfamiliar through overuse | Synonyms: banal, commonplace, old-hat, shopworn, stock, threadbare, timeworn, tired, trite, well-worn |
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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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| pyknic | (adjective) having a squat and fleshy build | Synonyms: endomorphic |
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| pyknotic | (adjective) of or relating to or exhibiting pyknosis | Synonyms: pycnotic |
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| topknotted | (adjective) (of a bird or animal) having a usually ornamental tuft or process on the head; often used in combination | Synonyms: crested, tufted |
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| unacknowledged | (adjective) not recognized or admitted | - |
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| (adjective) not openly acknowledged | - |
| unbeknown | (adjective) (usually used with `to') occurring or existing without the knowledge of | Synonyms: unbeknownst |
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| unbeknownst | (adjective) (usually used with `to') occurring or existing without the knowledge of | Synonyms: unbeknown |
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| unknowable | (adjective) not knowable | - |
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| unknowing | (adjective) unaware because of a lack of relevant information or knowledge | Synonyms: ignorant, unknowledgeable, unwitting |
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| unknowledgeable | (adjective) unaware because of a lack of relevant information or knowledge | Synonyms: ignorant, unknowing, unwitting |
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| unknown | (adjective) not known | - |
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| (adjective) being or having an unknown or unnamed source | Synonyms: nameless, unidentified, unnamed |
| (adjective) not famous or acclaimed | Synonyms: obscure, unsung |
| (adjective) not known before | Synonyms: strange |
| (adjective) not known to exist | - |