Third-person singular simple present indicative form of do ill

Britain standard spelling of ill-humored.

(archaic) Bad news circulates quickly because people like to gossip.

(mathematics) Not well-posed.

(insurance) Insurance that pays out a lump sum benefit on either the death or diagnosis of a serious (life-threatening) illness in the life assured within the term of the policy, and nothing on healthy survival to the end of the term.

(insurance) Insurance that pays out a lump sum benefit on the diagnosis of a serious (life-threatening) illness in the life assured within the term of the policy, and nothing on death or healthy survival to the end of the term.

(dated) poor or unfortunate; not well off

Poorly received; not enjoying the positive reception expected.

An optical illusion in which a white area takes on a pale tint of a thin, bright, intensely colored polygon surrounding it if the coloured polygon is itself surrounded by a thin, darker border.

An optical illusion where an edge between regions of the same shade causes them to be perceived as different shades.