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
Other infections: Some infectious organisms that do not typically target the liver, such as Escherichia coli (E. coli), streptococcus, tuberculosis, and others, can sometimes affect the liver, potentially causing liver fibrosis.
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Heidi Moawad, Verywell Health, 17 Oct. 2024
Alternatively, its upsurge might indicate that the virus has become more infectious — a very concerning, albeit less likely, development.
—Tribune News Service, The Mercury News, 29 Oct. 2024
And their enthusiasm, much like the zombie virus in the film-within-a-film, is infectious.
—Katie Rife, EW.com, 25 Oct. 2024
Polio is a highly infectious viral disease that mainly affects children under age 5.
—Sophia Saifi, CNN, 21 Oct. 2024
See all Example Sentences for infectious 
Heidi Moawad, Verywell Health, 17 Oct. 2024
Alternatively, its upsurge might indicate that the virus has become more infectious — a very concerning, albeit less likely, development.
—Tribune News Service, The Mercury News, 29 Oct. 2024
And their enthusiasm, much like the zombie virus in the film-within-a-film, is infectious.
—Katie Rife, EW.com, 25 Oct. 2024
Polio is a highly infectious viral disease that mainly affects children under age 5.
—Sophia Saifi, CNN, 21 Oct. 2024
See all Example Sentences for infectious
Thesaurus Entries Near infectious
Cite this Entry
“Infectious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/infectious. Accessed 21 Nov. 2024.
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