CONTAGIOUS, adjective

1. Containing or generating contagion; catching; that may be communicated by contact, or by a subtil excreted matter; as a contagious disease.

2. Poisonous; pestilential; containing contagion; as contagious air; contagious clothing.

3. Containing mischief that may be propagated; as contagious example.

4. That may be communicated from one to another, or may excite like affections in others.

His genius rendered his courage more contagious