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Definition of illness:

  1. Disease; indisposition; malady; disorder of health; sickness; as, a short or a severe illness.
  2. The condition of being ill, evil, or bad; badness; unfavorableness.
  3. Wrong moral conduct; wickedness.


ailing, relapse, hypochondria, contagion, ail, invalidism, epidemic, confinement, malady, unsoundness, affliction, weakness, prostration, ill, distemperature, sickness, disturbance, unwellness, seizure, health, insanity, trouble, distemper, fit.

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