unhealthy condition; poor health; indisposition; sickness.
Obsolete. wickedness.

Origin of illness

First recorded in 1490–1500; ill + -ness

Synonyms for illness Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for illness

Contemporary Examples of illness

Historical Examples of illness

British Dictionary definitions for illness



a disease or indisposition; sickness
a state of ill health
obsolete wickedness
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for illness

"disease, sickness," 1680s, from ill + -ness. Earlier it meant "bad moral quality" (c.1500).

Online Etymology Dictionary, © 2010 Douglas Harper

illness in Medicine




Disease of body or mind; poor health; sickness.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.