illness

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Poor health resulting from disease of body or mind; sickness.
• noun A disease.
• noun The quality of being disagreeable or unpleasant.
• noun Evil; wickedness.

from The Century Dictionary.

• noun Evilness; badness; wickedness; iniquity; moral perversion.
• noun A bad or unfavorable state or condition; unfavorableness.
• noun An attack of sickness; ailment; malady; disease: as, he has recovered from his illness.
• noun Synonyms Illness, Sickness, Ailment, complaint, disorder. Sick and sickness have been considered until within the present century essentially synonymous with ill and illness. Of late, English usage has tended to restrict sick and sickness to nausea, and American usage has followed it so far as to regard illness as a rather more elegant and less definite term: beyond that it does not seem likely to go. An ailment is generally of small account, comparatively, and local: as, his ailment was only a headache. None of these words represent ordinarily so serious an attack as disease, but illness and sickness may do so. See disease and debility.

from the GNU version of the Collaborative International Dictionary of English.

• noun obsolete The condition of being ill, evil, or bad; badness; unfavorableness.
• noun Disease; indisposition; malady; disorder of health; sickness.
• noun Wrong moral conduct; wickedness.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun countable An instance of a disease or poor health.
• noun uncountable A state of bad health or disease.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun impairment of normal physiological function affecting part or all of an organism