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Synonyms

sickness

American  
[sik-nis] / ˈsɪk nɪs /

noun

  1. a particular disease or malady.

  2. the state or an instance of being sick; illness.

  3. nausea; queasiness.


sickness British  
/ ˈsɪknɪs /

noun

  1. an illness or disease

  2. nausea or queasiness

  3. the state or an instance of being sick

"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

Etymology

Origin of sickness

before 1000; Middle English siknesse, seknesse, Old English sēocnesse. See sick 1, -ness

Compare meaning

How does sickness compare to similar and commonly confused words? Explore the most common comparisons:

Explanation

The condition of being unwell or having an illness is sickness. Your sickness during the month of November might mean you miss a lot of school. A well-known, Christian version of wedding vows includes a promise to "have and to hold...in sickness and in health." This means the couple agrees to stay together and support each other whether they're healthy or ill. Some sickness is a chronic or permanent kind of malady, while others are more specific, like morning sickness during pregnancy or a brief flash of sickness when your plane hits a patch of turbulence.

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Vocabulary lists containing sickness

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.

The statement said its sickness policy recognises all medical conditions, including PTSD.

From BBC • May 13, 2026

The use of GLP-1 medications -- particularly semaglutide, the active ingredient in Ozempic and Wegovy -- was associated with fewer psychiatric hospital visits and reduced sickness absence.

From Science Daily • May 4, 2026

Loyola senior Ejam Yohannes won the Invitational 400 in 46.29 after placing third in the event while battling sickness at Arcadia.

From Los Angeles Times • Apr. 19, 2026

That’s because we see spending on our health at a younger age as a way to prevent sickness later in life.

From The Wall Street Journal • Apr. 10, 2026

She remembered that last winter, before the sickness began, she had seen Fishtail walking from the mission school.

From "The Birchbark House" by Louise Erdrich

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