Not well prepared. Not ready, or not in condition to do a task.

To treat someone or something badly or unkindly; to abuse or mistreat.

bad, cruel or unkind treatment

plural of ill humor

(idiomatic) To become ill.

(intransitive, idiomatic) To become ill, to fall ill.

(idiomatic) A state of illness, or bad health.

Having a psychological disorder.

(uncountable, psychiatry) The property of being mentally ill; mental disorders taken as a whole. / (countable, psychiatry) A mental disorder.

Poorly defined; blurry, out of focus; lacking a clear boundary. / (mathematics) Defined in an inconsistent way.