V2 Vocabulary Building Dictionary



Definition: able to infect, in terms of spreading a disease or spreading or affecting an emotion or feeling

Synonyms: contagious, toxic, virulent, catching

Antonyms: contained, salutary, healthy

Tips: Although infectious is usually a negative word to describe something that can infect you with a disease, virus, or bacteria, infectious is often used to describe infectious emotion or energy: "His energy is infectious and everyone who encounters him absorbs his energy." Another common usage is that of "an infectious smile." This means that the person's friendly, beaming smile easily spreads to others.

Usage Examples:

Great motivational speakers like Tony Robbins have infectious energy. (contagious, easily spread)

Richie is a lot of fun to go out with, and his positive vibe is infectious. (contagious, easily spread)

I wouldn't go into his office, because I heard he's sick and apparently highly infectious. (contagious)

The energy and excitement at the concert were infectious. (contagious, catching)

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