illness
Americannoun
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poor health; sickness.
He grew up in an environment known for poverty, illness, and little opportunity for education.
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a specific sickness or disease, or an instance of such.
Please be as accurate as possible in listing your childhood illnesses.
- Synonyms:
- infirmity, affliction, ailment
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Obsolete. wickedness.
noun
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a disease or indisposition; sickness
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a state of ill health
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obsolete wickedness
Usage
What does illness mean? Illness is a state of poor health or sickness, as in I’ve had to miss a lot of work due to illness. The word illness is also commonly used to refer to a disease or instance of sickness. This sense of the word is often used when the type of disease is uncertain or unknown or when someone doesn’t want to specify what it is, as in They said that he is in the hospital with an illness, but they didn’t provide any further details. The word illness is based on the adjective ill, meaning sick. Example: The best way to avoid illness is to thoroughly wash your hands.
Etymology
Origin of illness
Compare meaning
How does illness compare to similar and commonly confused words? Explore the most common comparisons:
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
"Unfortunately, the alert was slow to circulate within the community, because people thought it was a mystical illness, and so, as a result, the sick were not taken to the hospital," Kamba said.
From Barron's • May 19, 2026
It feels like $800 gone—a tax on the possibility of illness rather than the consumption of anything tangible.
From The Wall Street Journal • May 18, 2026
About 1 in 10 people who get Legionnaires’ disease die due to complications from their illness, the CDC said.
From Los Angeles Times • May 18, 2026
By and large, experts point to systematic failures that leave Americans more vulnerable to mental illness and without access to drug-free interventions, which cost both time and money.
From Salon • May 18, 2026
His mother had died the year before after a long illness.
From "Hitler Youth: Growing Up in Hitler's Shadow" by Susan Campbell Bartoletti
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
