contagious

(adjective)

adjective

1. easily diffused or spread as from one person to another

- a contagious grin

Similar word(s): infectious

2. (of disease) capable of being transmitted by infection

Similar word(s): infectious, catching, communicable, contractable, transmissible, transmittable

Sentences with contagious as an adjective:

- The flu was so contagious that everybody in town got sick!

- Wearing jeans was a contagious fad at that time.

- They were highly contagious, spreading bacteria to other people.