| 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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