1. The condition of being ill, evil, or bad; badness; unfavorableness. The illness of the weather.
2. Disease; indisposition; malady; disorder of health; sickness; as, a short or a severe illness.
3. Wrong moral conduct; wickedness.
within the present century, there has been a tendency in England to use illness in the sense of a continuous disease, disorder of health, or sickness, and to confine sickness more especially to a sense of nausea, or sickness of the stomach.
Synonym: malady, disease, indisposition, ailment.
Origin: From ill.