Synonyms of infectious

infectious

adjective

in-ˈfek-shəs 

as in spreading

exciting a similar feeling or reaction in others

an infectious giggle that got the whole class laughing

Synonyms & Similar Words

• spreading
• catching
• contagious
• epidemic
• overwhelming
• tangible
• irresistible
• perceptible
• winning
• overpowering
• palpable
• inviting
• endearing
• fetching
• disarming
• winsome

Example Sentences

Recent Examples of infectious

For us, that might be feline infectious peritonitis, for example. — Forbes.com, 28 Sep. 2026

But, when Dovner questioned him lightly about the details, the man’s infectious laughter made Gleb even more convinced that such trifles were hardly worth mentioning at all. — Aleksandr Solzhenitsyn, New Yorker, 27 Sep. 2026

On the other sideline, there were tons of smiles, and none more infectious than that of Robinson, who finished the game with 194 rushing yards and two touchdowns. — Scott Thompson Outkick, FOXNews.com, 25 Sep. 2026

One study links living near new Kern County oil and gas wells to higher infection risk, while massive housing and solar construction promise more soil disturbance and airborne, infectious dust. — Susanne Rust follow, Los Angeles Times, 24 Sep. 2026