# illness

> English word · Noun · IPA /ˈɪl.nəs/ · frequency rank #3,563

## Definitions
1. An instance of a disease or poor health.
2. A state of bad health or disease.

## Etymology
From ill + -ness.

## Easily confused with
- **illnesses** (https://plainspell.com/en/vs/illness-vs-illnesses)

## Common misspellings (7)
`illenss`, `illnes`, `illnness`, `illnses`, `ilness`, `ilnless`, `lilness`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/illness