as in spreading
exciting a similar feeling or reaction in others
an infectious giggle that got the whole class laughing
Synonyms & Similar Words
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Example Sentences
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Recent Examples of infectious
The rest of the beauty comes from the ocean’s adorable creatures, which are enthusiastically studied by a group of lovable coral nerds with an infectious passion.
—
Tomris Laffly, Entertainment Weekly, 25 Dec. 2025
People gravitate to his personality and infectious smile.
—Jerry McDonald, Mercury News, 24 Dec. 2025
When Walker entered a conference room in 2019 and unveiled an ambitious, $1 billion plan to radically improve cancer care in Orange County to a few journalists – who tend to default toward skepticism – the audacity of her hope was infectious.
—Todd Harmonson, Oc Register, 23 Dec. 2025
His enthusiasm is unmissable—and thoroughly infectious.
—Shirley Li, The Atlantic, 22 Dec. 2025
See All Example Sentences for infectious
Tomris Laffly, Entertainment Weekly, 25 Dec. 2025
People gravitate to his personality and infectious smile.
—Jerry McDonald, Mercury News, 24 Dec. 2025
When Walker entered a conference room in 2019 and unveiled an ambitious, $1 billion plan to radically improve cancer care in Orange County to a few journalists – who tend to default toward skepticism – the audacity of her hope was infectious.
—Todd Harmonson, Oc Register, 23 Dec. 2025
His enthusiasm is unmissable—and thoroughly infectious.
—Shirley Li, The Atlantic, 22 Dec. 2025
See All Example Sentences for infectious
Recent Examples of Synonyms for infectious
catching
Adjective
-
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 10 Jan. 2026.
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