infectious
adjective
Definitions
(of an illness) Transmitted from one person to another, usually through the air breathed.
Example: Cancer is not infectious.
(of a person) Able to infect others.
Example: Despite feeling better, the patient is still infectious.
(of feelings and behaviour) Spreading quickly from one person to another.
Example: Her enthusiasm for work can be really infectious.
Memorable and invoking excitement or interest.
Example: Pop music is more infectious than elevator music.