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
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
Dame Felicity lived with "her illness with great dignity and acceptance" and "was characteristically classy and elegant to the end", the agent added.
From BBC • May 17, 2026
In the last eleven months of volunteering at the chevra kadisha, I had washed old men who perished on the streets, workers killed in factory accidents, and children taken by illness.
From "The City Beautiful" by Aden Polydoros
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.
