What is the meaning of ill?

noun

• An often persistent bodily disorder or disease; a cause for complaining.
  • synonyms: ailment, complaint

adjective

• Affected by an impairment of normal physical or mental function.
  • usage: "ill from the monotony of his suffering"
  • synonyms: sick
• Resulting in suffering or adversity.
  • usage: "ill effects"; "it's an ill wind that blows no good"
• Distressing.
  • usage: "ill manners"; "of ill repute"
• Indicating hostility or enmity.
  • usage: "you certainly did me an ill turn"; "ill feelings"; "ill will"
• Presaging ill fortune.
  • usage: "ill omens"; "ill predictions"; "my words with inauspicious thunderings shook heaven- P. B. Shelley; "a dead and ominous silence prevailed"; "a by-election at a time highly unpropitious for the Government"
  • synonyms: inauspicious, ominous

adverb

• (adv.) ((`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well)
  • usage: "he was ill prepared"; "it ill befits a man to betray old friends"; "the car runs badly"; "he performed badly on the exam"; "the team played poorly"; "ill-fitting clothes"; "an ill-conceived plan"
  • synonyms: badly, poorly
• Unfavorably or with disapproval.
  • usage: "tried not to speak ill of the dead"; "thought badly of him for his lack of concern"
  • synonyms: badly
• With difficulty or inconvenience; scarcely or hardly.
  • usage: "we can ill afford to buy a new car just now"