Synonyms of contagious

Adjective

1. contagious, infectious (vs. noninfectious)

usage: easily diffused or spread as from one person to another; "a contagious grin"

2. catching, communicable, contagious, contractable, transmissible, transmittable, infectious (vs. noninfectious)

usage: (of disease) capable of being transmitted by infection

Definition and meaning of contagious (Dictionary)