- (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."