Infectious /(?)/
In·fec·tious
Infectious
a.
-
Having qualities that may infect; communicable or caused by infection; pestilential; epidemic; as, an infectious fever; infectious clothing; infectious water; infectious vices.
Where the infectious pestilence.
-
Corrupting, or tending to corrupt or contaminate; vitiating; demoralizing.
It [the court] is necessary for the polishing of manners . . . but it is infectious even to the best morals to live always in it.
-
Contaminating with illegality; exposing to seizure and forfeiture. (Law)
Contraband articles are said to be of an infectious nature.
-
Capable of being easily diffused or spread; sympathetic; readily communicated; as, infectious mirth.
The laughter was so genuine as to be infectious.