ill

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Not healthy; sick.
• adjective Not normal; unsound.
• adjective Resulting in suffering; harmful or distressing.
• adjective Resulting from or suggestive of evil intentions.
• adjective Ascribing an objectionable quality.
• adjective Hostile or unfriendly.
• adjective Harmful; pernicious.
• adjective Not favorable; unpropitious.
• adjective Not measuring up to recognized standards of excellence, as of behavior or conduct.
• adjective Slang Excellent; outstanding.
• adverb In a bad, inadequate, or improper way. Often used in combination.
• adverb In an unfavorable way; unpropitiously.
• adverb Scarcely or with difficulty.
• noun Evil, wrongdoing, or harm.
• noun Something that causes suffering; trouble.
• noun Something that reflects in an unfavorable way on one.
• noun Sick people considered as a group. Often used with the.
• idiom (ill at ease) Anxious or unsure; uneasy.

from The Century Dictionary.

• Badly; imperfectly; unfavorably; unfortunately.
• Not easily; with hardship, pain, or difficulty: as, he is ill able to bear the loss.
• To do evil to; harm; injure.
• To slander; defame.
• noun Abbreviations of Illinois.
• noun Abbreviations of illustrated or of illustration.
• Inherently bad or evil; of pernicious quality or character; vicious; wicked; malevolent.
• Causing evil or harm; baneful; mischievous; pernicious; deleterious: as, it is an ill wind that blows nobody good.
• Marked or attended by evil or suffering; disastrous; wretched; miserable: as, an ill fate; an ill ending.
• Of bad import, bearing, or aspect; threatening; forbidding; harsh; inimical: as, ill news travels fast; an ill countenance.
• In a bad or disordered state morally; unbalanced; cross; crabbed; unfriendly; unpropitious; hostile: as, ill nature; ill temper; ill feeling; ill will.
• In a disordered state physically; diseased; impaired: as, to be ill of a fever; to be taken ill; ill health.
• Not proper; not legitimate or polite; rude; unpolished: as, ill manners; ill breeding.
• Unskilful; inexpert: as, I am ill at reckoning.
• noun Evil; wrong; wickedness; depravity.
• noun Misfortune; calamity; adversity; disaster; disease; pain.
• noun Anything that is discreditable or injurious.

from the GNU version of the Collaborative International Dictionary of English.

• noun Whatever annoys or impairs happiness, or prevents success; evil of any kind; misfortune; calamity; disease; pain.
• noun Whatever is contrary to good, in a moral sense; wickedness; depravity; iniquity; wrong; evil.
• adverb In a ill manner; badly; weakly.
• adjective Contrary to good, in a physical sense; contrary or opposed to advantage, happiness, etc.; bad; evil; unfortunate; disagreeable; unfavorable.
• adjective Contrary to good, in a moral sense; evil; wicked; wrong; iniquitious; naughtly; bad; improper.
• adjective Sick; indisposed; unwell; diseased; disordered.
• adjective Not according with rule, fitness, or propriety; incorrect; rude; unpolished; inelegant.
• adjective uneasy; uncomfortable; anxious.
• adjective enmity; resentment; bad blood.
• adjective lack of good breeding; rudeness.
• adjective ill or bad repute.
• adjective a disagreeable mood; bad temper.
• adjective bad disposition or temperament; sullenness; esp., a disposition to cause unhappiness to others.
• adjective anger; moroseness; crossness.