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Adjective: harmful  haa(r)m-ful
  1. Causing or capable of causing harm
    "too much sun is harmful to the skin"; "harmful effects of smoking"

See also: abusive, bad, bruising, calumniatory, calumnious, catastrophic, counterproductive, damaging, defamatory, deleterious, denigrating, denigrative, denigratory, destructive, detrimental, disadvantageous, hurtful, ill, injurious, insidious, libellous, libelous [US], malign, mischievous, nocent, noxious, offensive, painful, pernicious, prejudicial, prejudicious, ruinous, slanderous, stabbing, subtle, toxic, unfavorable [US], unfavourable [Brit, Cdn], unwholesome, wounding

Antonym: harmless

Encyclopedia: Harmful