as in spreading
exciting a similar feeling or reaction in others
an infectious giggle that got the whole class laughing
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Recent Examples of infectious
The vaccine is made from an inactivated virus, which means the virus is not infectious.
—
Ashley Wong, Health, 8 Oct. 2025
This bioweapon of a virus — known both as the superflu and also by its codename, Captain Trips — is highly infectious, and in short order, the initial outbreak in Arnette, Texas has now spread to every country on Earth.
—Ethan Siegel, Big Think, 7 Oct. 2025
The latter’s video focused on her seatmate, whose infectious giggles and wheezing breaths—which one commenter joked sounded like the engine—became the soundtrack to the plane fault.
—Maria Morava, MSNBC Newsweek, 7 Oct. 2025
The Gator spirit is infectious.
—Skye Sherman, Southern Living, 3 Oct. 2025
See All Example Sentences for infectious
Ashley Wong, Health, 8 Oct. 2025
This bioweapon of a virus — known both as the superflu and also by its codename, Captain Trips — is highly infectious, and in short order, the initial outbreak in Arnette, Texas has now spread to every country on Earth.
—Ethan Siegel, Big Think, 7 Oct. 2025
The latter’s video focused on her seatmate, whose infectious giggles and wheezing breaths—which one commenter joked sounded like the engine—became the soundtrack to the plane fault.
—Maria Morava, MSNBC Newsweek, 7 Oct. 2025
The Gator spirit is infectious.
—Skye Sherman, Southern Living, 3 Oct. 2025
See All Example Sentences for infectious
Recent Examples of Synonyms for infectious
catching
Adjective
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After an early-season injury to Connor Wong, Narváez stepped into the everyday catching role.—
Gabrielle Starr,
Boston Herald,
6 Oct. 2025
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The Twins could also consider internal options with catching/assistant bench coach Hank Conger among them.—
Betsy Helfand,
Twin Cities,
1 Oct. 2025
Cite this Entry
“Infectious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/infectious. Accessed 22 Oct. 2025.
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