| hilly | (adjective) having hills and crags | Synonyms: cragged, craggy, mountainous |
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| hornbill | (noun) bird of tropical Africa and Asia having a very large bill surmounted by a bony protuberance; related to kingfishers | - |
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| hydrilla | (noun) submersed plant with whorled lanceolate leaves and solitary axillary flowers; Old World plant naturalized in southern United States and clogging Florida's waterways | Synonyms: Hydrilla verticillata |
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| ill | (adjective) affected by an impairment of normal physical or mental function | Synonyms: sick |
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| (adjective) distressing | - |
| (adjective) resulting in suffering or adversity | - |
| (adjective) indicating hostility or enmity | - |
| (adjective) presaging ill fortune | Synonyms: inauspicious, ominous |
| (noun) an often persistent bodily disorder or disease; a cause for complaining | Synonyms: ailment, complaint |
| (adverb) (`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well | Synonyms: badly, poorly |
| (adverb) with difficulty or inconvenience; scarcely or hardly | - |
| (adverb) unfavorably or with disapproval | Synonyms: badly |
| illation | (noun) the reasoning involved in drawing a conclusion or making a logical judgment on the basis of circumstantial evidence and prior conclusions rather than on the basis of direct observation | Synonyms: inference |
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| illative | (adjective) relating to or having the nature of illation or inference | Synonyms: inferential |
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| (adjective) expressing or preceding an inference | - |
| (adjective) resembling or dependent on or arrived at by inference | Synonyms: inferential |
| illegal | (adjective) prohibited by law or by official or accepted rules | - |
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| illegalise | (verb) declare illegal; outlaw | Synonyms: criminalise, criminalize, illegalize, outlaw |
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| illegality | (noun) unlawfulness by virtue of violating some legal statute | - |
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| illegalize | (verb) declare illegal; outlaw | Synonyms: criminalise, criminalize, illegalise, outlaw |
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| illegally | (adverb) in an illegal manner | Synonyms: illicitly, lawlessly |
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| illegibility | (noun) the quality of writing (print or handwriting) that cannot be deciphered | - |
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| illegible | (adjective) (of handwriting, print, etc.) not legible | - |
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| illegibly | (adverb) in an illegible manner | Synonyms: undecipherably, unreadably |
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| illegitimacy | (noun) unlawfulness by virtue of not being authorized by or in accordance with law | - |
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| (noun) the status of being born to parents who were not married | Synonyms: bar sinister, bastardy |
| illegitimate | (adjective) of marriages and offspring; not recognized as lawful | - |
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| (adjective) contrary to or forbidden by law | Synonyms: illicit, outlaw, outlawed, unlawful |
| (noun) the illegitimate offspring of unmarried parents | Synonyms: bastard, by-blow, illegitimate child, love child, whoreson |
| illegitimately | (adverb) of biological parents not married to each other | Synonyms: out of wedlock |
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| (adverb) in a manner disapproved or not allowed by custom | Synonyms: illicitly |
| illiberal | (adjective) narrow-minded about cherished opinions | Synonyms: intolerant |
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| illiberality | (noun) a disposition not to be liberal (generous) with money | - |
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| illiberally | (adverb) in a manner that isn't broad-minded | Synonyms: intolerantly |
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| illicit | (adjective) contrary to accepted morality (especially sexual morality) or convention | - |
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| (adjective) contrary to or forbidden by law | Synonyms: illegitimate, outlaw, outlawed, unlawful |
| illicitly | (adverb) in a manner disapproved or not allowed by custom | Synonyms: illegitimately |
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| (adverb) in an illegal manner | Synonyms: illegally, lawlessly |
| illicitness | (noun) the quality of not conforming strictly to law | - |
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| illimitable | (adjective) without limits in extent or size or quantity | Synonyms: limitless, measureless, unmeasured |
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| illiquidity | (noun) the quality of being illiquid; a lack of liquidity; difficulty in selling out an asset. | - |
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| illiteracy | (noun) an inability to read | Synonyms: analphabetism |
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| (noun) ignorance resulting from not reading | - |
| illiterate | (adjective) not able to read or write | - |
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| (adjective) lacking culture, especially in language and literature | - |
| (adjective) uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specific field | Synonyms: ignorant |
| (noun) a person unable to read | Synonyms: illiterate person, nonreader |
| illness | (noun) impairment of normal physiological function affecting part or all of an organism | Synonyms: malady, sickness, unwellness |
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| illogic | (noun) invalid or incorrect reasoning | Synonyms: illogicality, illogicalness, inconsequence |
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| illogical | (adjective) lacking in correct logical relation | Synonyms: unlogical |
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| (adjective) lacking orderly continuity | Synonyms: confused, disconnected, disjointed, disordered, garbled, scattered, unconnected |
| illogicality | (noun) invalid or incorrect reasoning | Synonyms: illogic, illogicalness, inconsequence |
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| illogically | (adverb) in an illogical manner | - |
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| illogicalness | (noun) invalid or incorrect reasoning | Synonyms: illogic, illogicality, inconsequence |
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| illume | (verb) introduce light into | Synonyms: illuminate, illumine, light, light up |
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| illuminance | (noun) the luminous flux incident on a unit area | Synonyms: illumination |
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| illuminant | (noun) something that can serve as a source of light | - |
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| illuminate | (verb) introduce light into | Synonyms: illume, illumine, light, light up |
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| (verb) make free from confusion or ambiguity; make clear | Synonyms: clear, clear up, crystalise, crystalize, crystallise, crystallize, elucidate, enlighten, shed light on, sort out, straighten out |
| (verb) add embellishments and paintings to (medieval manuscripts) | - |
| illuminated | (adjective) provided with artificial light | Synonyms: lighted, lit, well-lighted |
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| illuminating | (adjective) tending to increase knowledge or dissipate ignorance | Synonyms: enlightening, informative |
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| illumination | (noun) painting or drawing included in a book (especially in illuminated medieval manuscripts) | Synonyms: miniature |
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| (noun) the luminous flux incident on a unit area | Synonyms: illuminance |
| (noun) an interpretation that removes obstacles to understanding | Synonyms: clarification, elucidation |
| (noun) the degree of visibility of your environment | - |
| (noun) a condition of spiritual awareness; divine illumination | Synonyms: light |
| illumine | (verb) introduce light into | Synonyms: illume, illuminate, light, light up |
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| illusion | (noun) the act of deluding; deception by creating illusory ideas | Synonyms: delusion, head game |
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| (noun) an illusory feat; considered magical by naive observers | Synonyms: conjuration, conjuring trick, deception, legerdemain, magic, magic trick, thaumaturgy, trick |
| (noun) something many people believe that is false | Synonyms: fancy, fantasy, phantasy |
| (noun) an erroneous mental representation | Synonyms: semblance |
| illusional | (adjective) marked by or producing illusion | Synonyms: illusionary |
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| illusionary | (adjective) marked by or producing illusion | Synonyms: illusional |
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| illusionist | (noun) a person with unusual powers of foresight | Synonyms: seer, visionary |
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| (noun) someone who performs magic tricks to amuse an audience | Synonyms: conjurer, conjuror, magician, prestidigitator |
| illusive | (adjective) based on or having the nature of an illusion | Synonyms: illusory |
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| illusoriness | (noun) The quality of resulting from an illusion; of being deceptive, imaginary, unreal. | - |
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| illusory | (adjective) based on or having the nature of an illusion | Synonyms: illusive |
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| illustrate | (verb) clarify by giving an example of | Synonyms: exemplify, instance |
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| (verb) depict with an illustration | - |
| (verb) supply with illustrations | - |
| illustration | (noun) a visual representation (a picture or diagram) that is used to make some subject more pleasing or easier to understand | - |
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| (noun) an item of information that is typical of a class or group | Synonyms: example, instance, representative |
| (noun) artwork that helps make something clear or attractive | - |
| (noun) showing by example | Synonyms: exemplification |
| illustrative | (adjective) clarifying by use of examples | Synonyms: exemplifying |
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| (adjective) serving to demonstrate | Synonyms: demonstrative |
| illustrator | (noun) an artist who makes illustrations (for books or magazines or advertisements etc.) | - |
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| illustrious | (adjective) having or conferring glory | - |
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| (adjective) widely known and esteemed | Synonyms: celebrated, famed, famous, far-famed, notable, noted, renowned |
| illustriously | (adverb) in an illustrious manner | - |
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| illustriousness | (noun) the property possessed by something or someone of outstanding importance or eminence | Synonyms: greatness |
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| inframaxillary | (adjective) relating to the lower jaw | Synonyms: mandibular |
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| instill | (verb) fill, as with a certain quality | Synonyms: impregnate, infuse, tincture |
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| (verb) produce or try to produce a vivid impression of | Synonyms: impress, ingrain |
| (verb) teach and impress by frequent repetitions or admonitions | Synonyms: inculcate, infuse |
| (verb) enter drop by drop | Synonyms: instil |
| (verb) impart gradually | Synonyms: transfuse |
| instillation | (noun) the introduction of a liquid (by pouring or injection) drop by drop | Synonyms: instillment, instilment |
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| (noun) a liquid that is instilled drop by drop | - |
| instillator | (noun) medical apparatus that puts a liquid into a cavity drop by drop | - |
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| instilling | (noun) teaching or impressing upon the mind by frequent instruction or repetition | Synonyms: inculcation, ingraining |
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| instillment | (noun) the introduction of a liquid (by pouring or injection) drop by drop | Synonyms: instillation, instilment |
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| ivorybill | (noun) large black-and-white woodpecker of southern United States and Cuba having an ivory bill; nearly extinct | Synonyms: Campephilus principalis, ivory-billed woodpecker |
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| jaboncillo | (noun) evergreen of tropical America having pulpy fruit containing saponin which was used as soap by Native Americans | Synonyms: China tree, chinaberry, false dogwood, Sapindus saponaria |
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| jillion | (noun) a very large indefinite number (usually hyperbole) | Synonyms: bazillion, billion, gazillion, million, trillion, zillion |
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| ketembilla | (noun) maroon-purple gooseberry-like fruit of India having tart-sweet purple pulp used especially for preserves | Synonyms: kitambilla, kitembilla |
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| (noun) a small shrubby spiny tree cultivated for its maroon-purple fruit with sweet purple pulp tasting like gooseberries; Sri Lanka and India | Synonyms: Ceylon gooseberry, Dovyalis hebecarpa, ketembilla tree, kitambilla, kitembilla |
| kill | (noun) the act of terminating a life | Synonyms: killing, putting to death |
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| (noun) the destruction of an enemy plane or ship or tank or missile | - |
| (noun) the body of an animal, or bodies of animals, killed by a person or another animal | - |
| (verb) mark for deletion, rub off, or erase | Synonyms: obliterate, wipe out |
| (verb) destroy a vitally essential quality of or in | - |
| (verb) cause to cease operating | - |
| (verb) tire out completely | - |
| (verb) end or extinguish by forceful means | Synonyms: stamp out |
| (verb) drink down entirely | Synonyms: belt down, bolt down, down, drink down, pop, pour down, toss off |
| (verb) cause to die; put to death, usually intentionally or knowingly | - |
| (verb) cause the death of, without intention | - |
| (verb) deprive of life | - |
| (verb) hit with great force | - |
| (verb) hit with so much force as to make a return impossible, in racket games | - |
| (verb) overwhelm with hilarity, pleasure, or admiration | - |
| (verb) be the source of great pain for | - |
| (verb) thwart the passage of | Synonyms: defeat, shoot down, vote down, vote out |
| (verb) be fatal | - |
| killable | (adjective) fit to kill, especially for food | - |
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| killdeer | (noun) American plover of inland waters and fields having a distinctive cry | Synonyms: Charadrius vociferus, kildeer, killdeer plover |
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| killer | (noun) predatory black-and-white toothed whale with large dorsal fin; common in cold seas | Synonyms: grampus, killer whale, orca, Orcinus orca, sea wolf |
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| (noun) a difficulty that is hard to deal with | - |
| (noun) someone who causes the death of a person or animal | Synonyms: slayer |
| (noun) the causal agent resulting in death | Synonyms: cause of death |
| killifish | (noun) small mostly marine warm-water carp-like schooling fishes; used as bait or aquarium fishes or in mosquito control | - |
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| killing | (adjective) very funny | Synonyms: sidesplitting |
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| (noun) the act of terminating a life | Synonyms: kill, putting to death |
| (noun) an event that causes someone to die | Synonyms: violent death |
| (noun) a very large profit | Synonyms: cleanup |
| killingly | (adverb) in a very humorous manner | Synonyms: sidesplittingly |
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| killjoy | (noun) someone who spoils the pleasure of others | Synonyms: party pooper, spoilsport, wet blanket |
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| kitambilla | (noun) maroon-purple gooseberry-like fruit of India having tart-sweet purple pulp used especially for preserves | Synonyms: ketembilla, kitembilla |
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| (noun) a small shrubby spiny tree cultivated for its maroon-purple fruit with sweet purple pulp tasting like gooseberries; Sri Lanka and India | Synonyms: Ceylon gooseberry, Dovyalis hebecarpa, ketembilla, ketembilla tree, kitembilla |
| kitembilla | (noun) maroon-purple gooseberry-like fruit of India having tart-sweet purple pulp used especially for preserves | Synonyms: ketembilla, kitambilla |
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| (noun) a small shrubby spiny tree cultivated for its maroon-purple fruit with sweet purple pulp tasting like gooseberries; Sri Lanka and India | Synonyms: Ceylon gooseberry, Dovyalis hebecarpa, ketembilla, ketembilla tree, kitambilla |
| krill | (noun) shrimp-like planktonic crustaceans; major source of food for e.g. baleen whales | - |
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| lactobacillus | (noun) a Gram-positive rod-shaped bacterium that produces lactic acid (especially in milk) | - |
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| lambkill | (noun) North American dwarf shrub resembling mountain laurel but having narrower leaves and small red flowers; poisonous to young stock | Synonyms: Kalmia angustifolia, pig laurel, sheep laurel |
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| landfill | (noun) a low area that has been filled in | - |
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| lilliputian | (adjective) very small | Synonyms: bantam, diminutive, flyspeck, midget, petite, tiny |
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| (adjective) (informal) small and of little importance | Synonyms: fiddling, footling, little, niggling, petty, picayune, piddling, piffling, trivial |
| (noun) a very small person (resembling a Lilliputian) | - |
| lumbermill | (noun) a mill for dressing logs and lumber | Synonyms: sawmill |
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| maillot | (noun) tights for dancers or gymnasts | - |
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| (noun) a woman's one-piece bathing suit | Synonyms: tank suit |
| mamilla | (noun) the small projection of a mammary gland | Synonyms: mammilla, nipple, pap, teat, tit |
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| mammilla | (noun) the small projection of a mammary gland | Synonyms: mamilla, nipple, pap, teat, tit |
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| mammillaria | (noun) any cactus of the genus Mammillaria | - |
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| mamoncillo | (noun) tropical American tree bearing a small edible fruit with green leathery skin and sweet juicy translucent pulp | Synonyms: genip, ginep, honey berry, Melicocca bijuga, Melicocca bijugatus, Spanish lime, Spanish lime tree |
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| mandrill | (noun) baboon of west Africa with a bright red and blue muzzle and blue hindquarters | Synonyms: Mandrillus sphinx |
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| manilla | (noun) a strong paper or thin cardboard with a smooth light brown finish made from e.g. Manila hemp | Synonyms: manila, manila paper, manilla paper |
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| mantilla | (noun) a woman's silk or lace scarf | - |
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| (noun) short cape worn by women | Synonyms: mantelet |
| maravilla | (noun) leafy wildflower having fragrant slender white or pale pink trumpet-shaped flowers; southwestern United States and northern Mexico | Synonyms: Mirabilis longiflora, sweet four o'clock |
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| (noun) wildflower having vibrant deep pink tubular evening-blooming flowers; found in sandy and desert areas from southern California to southern Colorado and into Mexico | Synonyms: Colorado four o'clock, desert four o'clock, Mirabilis multiflora |
| marseille | (noun) strong cotton fabric with a raised pattern; used for bedspreads | - |
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| maxilla | (noun) the jaw in vertebrates that is fused to the cranium | Synonyms: maxillary, upper jaw, upper jawbone |
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| maxillaria | (noun) any of numerous orchids of the genus Maxillaria often cultivated for their large brilliantly colored solitary flowers | - |
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| maxillary | (adjective) of or relating to the upper jaw | - |
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| (noun) the jaw in vertebrates that is fused to the cranium | Synonyms: maxilla, upper jaw, upper jawbone |
| maxilliped | (noun) One of a set of three paired appendages on the thorax of a decapod crustacean, located just posterior to the maxillae and used in feeding. | Synonyms: gnathopod |
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| maxillodental | (adjective) of or relating to the upper jaw and its associated teeth | - |
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| maxillofacial | (adjective) of or relating to the upper jaw and face (particularly with reference to specialized surgery of the maxilla) | - |
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| maxillomandibular | (adjective) relating to the upper and lower jaws | - |
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| megillah | (noun) (Yiddish) a long boring tediously detailed account | - |
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| methicillin | (noun) antibiotic drug of the penicillin family used in the treatment of certain staphylococcal infections | - |
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