(mathematics) Not well-posed.

(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.

Unsubstantiated, not based on fact or evidence.

Having or displaying malevolence or ill-will.

plural of ill turn

(dated) An act of unkindness or enmity. / (dated) A change for the worse.

An enzootic and often fatal viral disease of sheep and other domestic animals, spread by ticks. It is characterized by muscular tremors and spasms, followed by more or less complete paralysis. The principal lesion is an inflammation of the membranes covering the brain and spinal cord.

Alternative form of louping ill.