what is harmful
causing or capable of causing harm DDT has been proven to be extremely harmful to the environment Synonyms adverse, bad, baleful, baneful, damaging, dangerous, deleterious, detrimental, evil, hurtful, ill, injurious, mischievous, nocuous, noxious, pernicious, prejudicial, wicked Related Words hostile, inimical, unfriendly; contagious, deadly, ...