Antonyms of adj nefarious

1 sense of nefarious

Sense 1
nefarious, villainous -- (extremely wicked; "nefarious schemes"; "a villainous plot"; "a villainous band of thieves")

INDIRECT (VIA wicked) -> virtuous -- (morally excellent)

Similarity of adj nefarious

1 sense of nefarious

Sense 1
nefarious, villainous -- (extremely wicked; "nefarious schemes"; "a villainous plot"; "a villainous band of thieves")
       => wicked (vs. virtuous) -- (morally bad in principle or practice)