Antonyms of adj noncontagious

1 sense of noncontagious

Sense 1
noncommunicable, noncontagious, nontransmissible -- ((of disease) not capable of being passed on)

INDIRECT (VIA noninfectious) -> infectious -- (easily spread; "fear is exceedingly infectious; children catch it from their elders"- Bertrand Russell)

Similarity of adj noncontagious

1 sense of noncontagious

Sense 1
noncommunicable, noncontagious, nontransmissible -- ((of disease) not capable of being passed on)
       => noninfectious (vs. infectious) -- (not infectious)