[ il-nis ]
See synonyms for: illnessillnesses on

  1. poor health; sickness: He grew up in an environment known for poverty, illness, and little opportunity for education.

  2. a specific sickness or disease, or an instance of such: Please be as accurate as possible in listing your childhood illnesses.

  1. Obsolete. wickedness.

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Origin of illness

First recorded in 1490–1500; ill + -ness

Other words for illness

Words Nearby illness Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use illness in a sentence

British Dictionary definitions for illness


/ (ˈɪlnɪs) /

  1. a disease or indisposition; sickness

  2. a state of ill health

  1. 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