1. infectious - Adjective
2. infectious - Adjective Satellite
Having qualities that may infect; communicable or caused by infection; pestilential; epidemic; as, an infectious fever; infectious clothing; infectious air; infectious vices.
Corrupting, or tending to corrupt or contaminate; vitiating; demoralizing.
Contaminating with illegality; exposing to seizure and forfeiture.
Capable of being easily diffused or spread; sympathetic; readily communicated; as, infectious mirth.
Source: Webster's dictionaryLaughter, n. An interior convulsion, producing a distortion of the features and accompanied by inarticulate noises. It is infectious and, though intermittent, incurable. Ambrose Bierce
Failure on the other hand is infectious. The world is full of charming failures (for all charming people have something to conceal, usually their total dependence on the appreciation of others) and unless the writer is quite ruthless with these amiable footlers, they will drag him down with them. Cyril Connolly
The girl is infectious human waste, and she's confused and afraid to commit to the wrong thing and so she won't commit to anything. Chuck Palahniuk
Joy is more infectious than leprosy. Baba Amte
Chieftanship is not infectious. Lamba Proverb
Chieftanship is not infectious. Bantu Proverb