1
: having a thick or sticky consistency : viscid
viscous secretions
viscous corn syrup
2
technical
: having or characterized by a high resistance to flow
viscous lava
viscously
adverb
viscousness
noun
Examples of viscous in a Sentence
viscous syrup that takes forever to pour from a narrow-neck bottle
Recent Examples on the Web
What Does Soju Taste Like? With its crisp and neutral flavor profile, soju is often compared to vodka, but with a slightly sweeter taste, more viscous texture, and lower alcohol content—typically about half that of vodka.
—
Heather Riske, Better Homes & Gardens, 18 May 2025
Beta-glucan forms a viscous (thick) substance in the body that draws in cholesterol and helps remove it.
—Amy Brownstein, Verywell Health, 6 May 2025
All three had a very viscous Martian interior, consistent with a relatively cold interior.
—Ars Technica, 28 Feb. 2025
Venezuela produces a denser, more viscous type of oil that is not common in the United States.
—Rebecca F. Elliott, New York Times, 26 Feb. 2025
See All Example Sentences for viscous
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Heather Riske, Better Homes & Gardens, 18 May 2025
Beta-glucan forms a viscous (thick) substance in the body that draws in cholesterol and helps remove it.
—Amy Brownstein, Verywell Health, 6 May 2025
All three had a very viscous Martian interior, consistent with a relatively cold interior.
—Ars Technica, 28 Feb. 2025
Venezuela produces a denser, more viscous type of oil that is not common in the United States.
—Rebecca F. Elliott, New York Times, 26 Feb. 2025
See All Example Sentences for viscous
Cite this Entry
“Viscous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/viscous. Accessed 28 May. 2025.
Copy CitationKids Definition
viscous
adjective
vis·cous
ˈvis-kəs 
1
: having the characteristic of stickiness
2
: having or marked by viscosity
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