Ill-mannered adjective Impolite; rude.

Ill-minded adjective Ill- disposed. Byron.

Ill-natured adjective
1. Of habitual bad temper; peevish; fractious; cross; crabbed; surly; as, an ill-natured person.

2. Dictated by, or indicating, ill nature; spiteful. "The ill-natured task refuse." Addison.

3. Intractable; not yielding to culture. [ R.] " Ill-natured land." J. Philips.

-- Ill`-na"tured*ly , adverb -- Ill`- na"tured*ness , noun

Ill-nurtured adjective Ill- bred. Shak.

Ill-omened adjective Having unlucky omens; inauspicious. See Note under Ill , adverb

Ill-starred adjective Fated to be unfortunate; unlucky; as, an ill-starred man or day.

Ill-tempered adjective
1. Of bad temper; morose; crabbed; sour; peevish; fretful; quarrelsome.

2. Unhealthy; ill-conditioned. [ Obsolete]

So ill-tempered I am grown, that I am afraid I shall catch cold, while all the world is afraid to melt away.

Pepys.

Ill-timed adjective Done, attempted, or said, at an unsuitable or unpropitious time.

Ill-used adjective Misapplied; treated badly.

Illness noun [ From Ill .]
1. The condition of being ill, evil, or bad; badness; unfavorableness. [ Obsolete] "The illness of the weather." Locke.

2. Disease; indisposition; malady; disorder of health; sickness; as, a short or a severe illness .

3. Wrong moral conduct; wickedness. Shak.

Syn. -- Malady; disease; indisposition; ailment. -- Illness , Sickness . Within the present century, there has been a tendency in England to use illness in the sense of a continuous disease, disorder of health, or sickness, and to confine sickness more especially to a sense of nausea, or "sickness of the stomach."

Illocality noun Want of locality or place. [ R.] Cudworth.

Illogical adjective Ignorant or negligent of the rules of logic or correct reasoning; as, an illogical disputant; contrary of the rules of logic or sound reasoning; as, an illogical inference. -- Il*log"ic*al*ly , adverb -- Il*log"ic*al*ness , noun

Illtreat transitive verb To treat cruelly or improperly; to ill use; to maltreat.

Illude transitive verb [ imperfect & past participle Illuded ; present participle & verbal noun Illuding .] [ Latin illudere , illusum ; prefix il- in + ludere to play: confer Old French illuder . See Ludicrous .] To play upon by artifice; to deceive; to mock; to excite and disappoint the hopes of.

Illume transitive verb [ imperfect & past participle Illumed ; present participle & verbal noun Illuming .] [ Confer French illuminer . See Illuminate .] To throw or spread light upon; to make light or bright; to illuminate; to illumine. Shak.

The mountain's brow,
Illumed with fluid gold.

Thomson.

Illuminable adjective Capable of being illuminated.

Illuminant noun [ Latin illuminans , -antis , present participle of illuminare .] That which illuminates or affords light; as, gas and petroleum are illuminants . Boyle.

Illuminary adjective Illuminative.

Illuminate transitive verb [ imperfect & past participle Illuminated ; present participle & verbal noun Illuminating .] [ Latin illuminatus , past participle of illuminare ; prefix il- in + luminare to enlighten, from lumen light. See Luminous , and confer Illume , Illumine , Enlimn , Limn .]
1. To make light; to throw light on; to supply with light, literally or figuratively; to brighten.

2. To light up; to decorate with artificial lights, as a building or city, in token of rejoicing or respect.

3. To adorn, as a book or page with borders, initial letters, or miniature pictures in colors and gold, as was done in manuscripts of the Middle Ages.

4. To make plain or clear; to dispel the obscurity to by knowledge or reason; to explain; to elucidate; as, to illuminate a text, a problem, or a duty.

Illuminate intransitive verb To light up in token or rejoicing.

Illuminate adjective [ Latin illuminatus , past participle ] Enlightened. Bp. Hall.

Illuminate noun One who is enlightened; esp., a pretender to extraordinary light and knowledge.

Illuminati noun plural [ Latin illuminatus . See Illuminate , transitive verb , and confer Illuminee .] Literally, those who are enlightened ; -- variously applied as follows: --

1. (Eccl.) Persons in the early church who had received baptism; in which ceremony a lighted taper was given them, as a symbol of the spiritual illumination they has received by that sacrament.

2. (Eccl. Hist.) Members of a sect which sprung up in Spain about the year 1575. Their principal doctrine was, that, by means of prayer, they had attained to so perfect a state as to have no need of ordinances, sacraments, good works, etc.; -- called also Alumbrados , Perfectibilists , etc.

3. (Mod. Hist.) Members of certain associations in Modern Europe, who combined to promote social reforms, by which they expected to raise men and society to perfection, esp. of one originated in 1776 by Adam Weishaupt, professor of canon law at Ingolstadt, which spread rapidly for a time, but ceased after a few years.

4. Also applied to: (a) An obscure sect of French Familists; (b) The Hesychasts, Mystics, and Quietists; (c) The Rosicrucians.

5. Any persons who profess special spiritual or intellectual enlightenment.

Illuminating adjective Giving or producing light; used for illumination.

Illuminating gas . See Gas , noun , 2 (a) .

Illumination noun [ Latin illuminatio : confer French illumination .]
1. The act of illuminating, or supplying with light; the state of being illuminated.

2. Festive decoration of houses or buildings with lights.

3. Adornment of books and manuscripts with colored illustrations. See Illuminate , transitive verb , 3.

4. That which is illuminated, as a house; also, an ornamented book or manuscript.

5. That which illuminates or gives light; brightness; splendor; especially, intellectual light or knowledge.

The illumination which a bright genius giveth to his work.

Felton.

6. (Theol.) The special communication of knowledge to the mind by God; inspiration.

Hymns and psalms . . . are framed by meditation beforehand, or by prophetical illumination are inspired.

Hooker.

Illuminatism noun Illuminism. [ R.]

Illuminative adjective [ Confer French illuminatif .] Tending to illuminate or illustrate; throwing light; illustrative. " Illuminative reading." Carlyle.

Illuminator noun [ Latin , an enlightener, Late Latin also, an illuminator of books.]
1. One whose occupation is to adorn books, especially manuscripts, with miniatures, borders, etc. See Illuminate , transitive verb , 3.

2. A condenser or reflector of light in optical apparatus; also, an illuminant.

Illumine transitive verb [ Confer French illuminer . See Illuminate .] To illuminate; to light up; to adorn.

Illuminee noun [ French illuminé . Confer Illuminati .] One of the Illuminati.

Illuminer noun One who, or that which, illuminates.

Illuminism noun [ Confer French illuminisme .] The principles of the Illuminati.

Illuministic adjective Of or pertaining to illuminism, or the Illuminati.

Illuminize transitive verb [ imperfect & past participle Illuminized ; present participle & verbal noun Illuminizing .] To initiate the doctrines or principles of the Illuminati.

Illuminous adjective Bright; clear. [ R.] H. Taylor.

Illure transitive verb [ Prefix il- in + lure .] To deceive; to entice; to lure. [ Obsolete]

The devil insnareth the souls of many men, by illuring them with the muck and dung of this world.

Fuller.

Illusion noun [ French illusion , Latin illusio , from illu dere, illusum , to illude. See Illude .]
1. An unreal image presented to the bodily or mental vision; a deceptive appearance; a false show; mockery; hallucination.

To cheat the eye with blear illusions .

Milton.

2. Hence: Anything agreeably fascinating and charming; enchantment; witchery; glamour.

Ye soft illusions , dear deceits, arise!

Pope.

3. (Physiol.) A sensation originated by some external object, but so modified as in any way to lead to an erroneous perception; as when the rolling of a wagon is mistaken for thunder.

» Some modern writers distinguish between an illusion and hallucination , regarding the former as originating with some external object, and the latter as having no objective occasion whatever.

4. A plain, delicate lace, usually of silk, used for veils, scarfs, dresses, etc.

Syn. -- Delusion; mockery; deception; chimera; fallacy. See Delusion . Illusion , Delusion . Illusion refers particularly to errors of the sense; delusion to false hopes or deceptions of the mind. An optical deception is an illusion ; a false opinion is a delusion . E. Edwards.

Illusionable adjective Liable to illusion.

Illusionist noun One given to illusion; a visionary dreamer.

Illusive adjective [ See Illude .] Deceiving by false show; deceitful; deceptive; false; illusory; unreal.

Truth from illusive falsehood to command.

Thomson.

Illusively adverb In a illusive manner; falsely.

Illusiveness noun The quality of being illusive; deceptiveness; false show.

Illusory adjective [ Confer French illusore .] Deceiving, or tending of deceive; fallacious; illusive; as, illusory promises or hopes.

Illustrable adjective Capable of illustration. Sir T. Browne.

Illustrate transitive verb [ imperfect & past participle Illustrated ; present participle & verbal noun Illustrating .] [ Latin illustratus , past participle of illustrare to illustrate, from illustris bright. See Illustrious .]
1. To make clear, bright, or luminous.

Here, when the moon illustrates all the sky.

Chapman.

2. To set in a clear light; to exhibit distinctly or conspicuously. Shak.

To prove him, and illustrate his high worth.

Milton.

3. To make clear, intelligible, or apprehensible; to elucidate, explain, or exemplify, as by means of figures, comparisons, and examples.

4. To adorn with pictures, as a book or a subject; to elucidate with pictures, as a history or a romance.

5. To give renown or honor to; to make illustrious; to glorify. [ Obsolete]

Matter to me of glory, whom their hate
Illustrates .

Milton.

Illustrate adjective [ Latin illustratus , past participle ] Illustrated; distinguished; illustrious. [ Obsolete]

This most gallant, illustrate , and learned gentleman.

Shak.

Illustration noun [ Latin illustratio : confer French illustration .]
1. The act of illustrating; the act of making clear and distinct; education; also, the state of being illustrated, or of being made clear and distinct.

2. That which illustrates; a comparison or example intended to make clear or apprehensible, or to remove obscurity.

3. A picture designed to decorate a volume or elucidate a literary work.

Illustrative adjective
1. Tending or designed to illustrate, exemplify, or elucidate.

2. Making illustrious. [ Obsolete]

Illustratively adverb By way of illustration or elucidation. [ R.] Sir T. Browne.

Illustrator noun [ Latin ] One who illustrates.