Antonyms of adj obnoxious

1 sense of obnoxious

Sense 1
objectionable, obnoxious -- (causing disapproval or protest; "a vulgar and objectionable person")

INDIRECT (VIA offensive) -> inoffensive -- (giving no offense; "a quiet inoffensive man"; "a refreshing inoffensive stimulant")

Similarity of adj obnoxious

1 sense of obnoxious

Sense 1
objectionable, obnoxious -- (causing disapproval or protest; "a vulgar and objectionable person")
       => offensive (vs. inoffensive) -- (unpleasant or disgusting especially to the senses; "offensive odors")

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