Antonyms of adj innoxious

1 sense of innoxious

Sense 1
innoxious -- (having no adverse effect)

INDIRECT (VIA innocuous) -> noxious -- (injurious to physical or mental health; "noxious chemical wastes"; "noxious ideas")

Similarity of adj innoxious

1 sense of innoxious

Sense 1
innoxious -- (having no adverse effect)
       => innocuous (vs. noxious) -- (not injurious to physical or mental health)