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Adjective harmful has 6 senses
  1. noxious, harmful - injurious to physical or mental health; "noxious chemical wastes"; "noxious ideas"
  2. harmful - able or likely to do harm
    safe (indirect, via dangerous)
  3. harmful - causing or capable of causing harm; "too much sun is harmful to the skin"; "harmful effects of smoking"
    harmless, innocent, innocuous, inoffensive, unoffending
  4. disadvantageous, harmful - constituting a disadvantage
  5. adverse, harmful, inauspicious, untoward - contrary to your interests or welfare; "adverse circumstances"; "made a place for themselves under the most untoward conditions"
    Antonyms: favorable, favourable (indirect, via unfavorable)
  6. evil, harmful, injurious - tending to cause great harm
    Antonyms: benign, benignant (indirect, via malign)
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