Antonyms of adj noxious

1 sense of noxious

Sense 1
noxious (vs. innocuous) -- (injurious to physical or mental health; "noxious chemical wastes"; "noxious ideas")

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

Similarity of adj noxious

1 sense of noxious

Sense 1
noxious (vs. innocuous) -- (injurious to physical or mental health; "noxious chemical wastes"; "noxious ideas")
       => baneful, deadly, pernicious, pestilent -- (exceedingly harmful)
       => corrupting, degrading -- (harmful to the mind or morals; "corrupt judges and their corrupting influence"; "the vicious and degrading cult of violence")
       => vesicatory, vesicant -- (causing blisters)
          Also See-> harmful#1; toxic#1; unwholesome#1