illness

n. disease, sickness

Illness (sometimes referred to as ill-health) can be defined as a state of poor health.
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Illness /ill·ness/ disease. emotional illness a colloquialism for mental disorder, but not usually including mental retardation or mental [more]Illness - Community and Resources

Noun
1. impairment of normal physiological function affecting part or all of an organism
(synonym) unwellness, malady, sickness
(antonym) health, wellness
(hypernym) ill health, unhealthiness, health problem
(hyponym) ague

(n.)
Wrong moral conduct; wickedness.
  

(n.)
The condition of being ill, evil, or bad; badness; unfavorableness.
  

(n.)
Disease; indisposition; malady; disorder of health; sickness; as, a short or a severe illness.