viscous

adjective

vis·​cous ˈvi-skəs 

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

Synonyms

• ropy
• ropey
• syrupy
• thick
• viscid

Examples of viscous in a Sentence

viscous syrup that takes forever to pour from a narrow-neck bottle

Recent Examples on the Web

Instant Shine Mask for $15: Infused with biotin, glycerin, hyaluronic acid, and red raspberry seed oil, this translucent, slightly viscous amber liquid purportedly seals the hair cuticle for a smooth and silky result. —Louryn Strampe, WIRED, 2 Feb. 2025

Four teenagers have been cited in connection with the viscous killing of a coyote in Chicago city limits this month, police confirmed to USA TODAY Tuesday. —Natalie Neysa Alund, USA TODAY, 28 Jan. 2025

The palate practically bursts with orange blossom honey, a rare and delicate treat, or perhaps honey and orange marmalade on buttered toast, complete with a viscous mouthfeel for its 92 proof. —David Thomas Tao, Forbes, 3 Jan. 2025

The bourbon is creamy on the palate with an oily, viscous texture and a pronounced mouth weight, featuring flavors of blackberry jam, vanilla laced-crème brûlée, caramel, candied orange zest, and milk chocolate notes. —Joseph V Micallef, Forbes, 19 Dec. 2024

Word History

Etymology

Middle English viscouse, from Anglo-French viscos, from Late Latin viscosus full of birdlime, viscous, from Latin viscum mistletoe, birdlime; akin to Old High German wīhsila cherry, Greek ixos mistletoe

First Known Use

14th century, in the meaning defined at sense 1

Kids Definition

viscous

adjective

vis·​cous ˈvis-kəs 

1

: having the characteristic of stickiness

2

: having or marked by viscosity

Medical Definition

viscous

adjective

vis·​cous ˈvis-kəs 

1

: having a glutinous consistency and the quality of sticking or adhering : viscid

2

: having or characterized by viscosity

a viscous flow