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

Many kinds of infectious agents are spread through contact with fomites, including influenza viruses, norovirus, and rotavirus. — Encyclopedia Britannica, 23 Oct. 2026

As for the neighborhood, the Brera district is a favorite of both locals and visitors with its unique atmosphere that combines the best of historic Milan with the restless and infectious energy of the city’s creative scene today. — Condé Nast, Condé Nast Traveler, 22 Oct. 2026

Skerritt was often memorable in supporting roles for his quiet, powerful presence and infectious smile. — Tom Tapp, Deadline, 22 Oct. 2026

Roivant and its spinout Priovant said Wednesday that their immune-modifying pill Lisraya was more effective than placebo in treating the inflammatory eye disease non-infectious uveitis. — Jason Mast, STAT, 21 Oct. 2026