Synonyms of viscous

viscous

adjective

ˈvi-skəs 

as in thick

being of a consistency that resists flow

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

Synonyms & Similar Words

• thick
• sticky
• syrupy
• heavy
• viscid
• ropy
• creamy
• turbid
• thickened
• condensed
• gelatinous
• undiluted
• glutinous
• thickish
• gooey
• gummy
• concentrated
• slushy
• gluey
• semifluid
• semiliquid
• jellylike

Antonyms & Near Antonyms

• thin
• runny
• watery
• fluid
• liquid
• soupy
• flowing
• weak
• dilute
• diluted
• watered-down

Example Sentences

Recent Examples of viscous

The soluble fiber in oats, particularly the polysaccharide beta-glucan, forms a viscous gel in the digestive tract. — Lauren Manaker Ms, Health, 22 May 2026

Not only can the viscous substances gunk up the machine, leaving a residue and potentially feeding bacteria, but prolonged exposure to these molecules in the air can have negative effects, according to the American Lung Association. — Terri Williams, Architectural Digest, 16 Apr. 2026

That, the researchers surmise, is driving a general eastward flow of material through the viscous mantle. — ArsTechnica, 10 Apr. 2026

Cormorants that tried to clean each other with their beaks died after ingesting the viscous muck. — Jeffrey Marlow, New Yorker, 5 Apr. 2026