• (archaic) Morally reprehensible (of behaviour etc.); blameworthy. [from 13th c.]
  • Unwell in terms of health or physical condition; sick. [from 15th c.]

    "I've been ill with the flu for the past few days."

  • (slang) Extremely bad (bad enough to make one ill). Generally used indirectly with to be.

    "That band was ill."

  • (obsolete) Evil; wicked (of people). [13th-19th c.]
  • Unpropitious, unkind, faulty, not up to reasonable standard.

    "ill manners; "

  • (hip-hop slang) Sublime, with the connotation of being so in a singularly creative way. [This sense sometimes declines in AAVE as ill, comparative iller, superlative illest.]
  • Indicative of unkind or malevolent intentions; harsh, cruel. [from 14th c.]

    "He suffered from ill treatment."

  • Having an urge to vomit. [from 20th c.]

    "Seeing those pictures made me ill."


  • Not well; imperfectly, badly; hardly.


  • Evil; moral wrongfulness.
  • (US, slang) PCP, phencyclidine.
  • Harm or injury.

    "I wouldn't want you to do me ill."

  • Unfavorable remarks or opinions.

    "Do not speak ill of the dead."

  • (often pluralized) Trouble; distress; misfortune; adversity.

    "Music won't solve all the world's ills, but it can make them easier to bear."

  • A physical ailment; an illness.

    "I am incapacitated by rheumatism and other ills."

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