unimmunized

adjective

un·​im·​mu·​nized ˌən-ˈi-myə-ˌnīzd How to pronounce unimmunized (audio)
variants or chiefly British unimmunised
: not made immune (as by vaccination) : not immunized
Because your child has been immunized, she faces no danger of playing with an unimmunized child.Paul G. Donohue

Examples of unimmunized in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
In even rarer instances, the live virus can mutate into a form capable of starting new outbreaks among unimmunized people where vaccination rates are low. CNN Money, 5 Aug. 2025 Wendy Hasson, a pediatric intensive care physician in Oregon, knows the tragedy that can befall an unimmunized child. Donna St. George, Anchorage Daily News, 27 Aug. 2022 Some unimmunized people have experienced early negativity, too, and many people who have gotten their shots still test positive before falling ill. SARS-CoV-2 traits, too, could be flipping the sickness script, which brings us to the virus hypothesis. Katherine J. Wu, The Atlantic, 10 June 2022 Humble, while stressing that data is still emerging, says omicron is proving highly contagious, much more than delta, particularly for those unimmunized and previously infected with COVID-19. Gabe Lacques, USA TODAY, 15 Dec. 2021 Again, the variant poses the biggest threat for the unimmunized. Justin Ray, Los Angeles Times, 28 June 2021

Word History

First Known Use

1894, in the meaning defined above

Time Traveler
The first known use of unimmunized was in 1894

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Cite this Entry

“Unimmunized.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unimmunized. Accessed 5 Jul. 2026.

Medical Definition

unimmunized

adjective
un·​im·​mu·​nized
variants or chiefly British unimmunised
: not immunized
unimmunized children
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