Antonyms of adv harmfully

1 sense of harmfully

Sense 1
detrimentally, harmfully, noxiously -- (in a detrimental manner)
       Antonym of harmlessly (Sense 1)
      => harmlessly -- (in a harmless manner; "this is a harmlessly childish game")

Synonyms of adv harmfully

1 sense of harmfully

Sense 1
detrimentally, harmfully, noxiously -- (in a detrimental manner)