unvaccinated

adjective

un·​vac·​ci·​nat·​ed ˌən-ˈvak-sə-ˌnā-təd 

: not having received a vaccine : not vaccinated

children unvaccinated for measles

Examples of unvaccinated in a Sentence

Recent Examples on the Web

Shortly after taking office, Kennedy began expressing interest in looking at rates of autism and other conditions among vaccinated versus unvaccinated children, and has raised the idea multiple times, according to five current and former officials. — CNN Money, 16 July 2026

The National Association of State Health Veterinarians says all unvaccinated dogs and cats exposed to a rabid animal need to be quarantined for four months and vaccinated one month before being released. — Dan Raby, CBS News, 13 July 2026

This second case follows confirmation that an unvaccinated adult who had traveled abroad returned home to Connecticut two weeks ago and began to show symptoms of measles after returning. — Staff Report, Hartford Courant, 29 June 2026

Researchers then checked whether the patients had been vaccinated, and used the information to calculate the odds of a positive test in the groups of unvaccinated and vaccinated individuals, respectively. — Rachel Raposas, PEOPLE, 24 June 2026

Word History

First Known Use

1871, in the meaning defined above

Rhymes for unvaccinated

• vaccinated

Medical Definition

unvaccinated

adjective

un·​vac·​ci·​nat·​ed -ˈvak-sə-ˌnāt-əd 

: not vaccinated

unvaccinated children