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Definition of 'harmful'

Adjective

  1. injurious to physical or mental health; "noxious chemical wastes"; "noxious ideas"
       Synonyms: noxious
       Antonyms: innocuous harmless
  2. able or likely to do harm
  3. causing or capable of causing harm; "too much sun is harmful to the skin"; "harmful effects of smoking"
       Antonyms: harmless
  4. constituting a disadvantage
       Synonyms: disadvantageous
       Antonyms: advantageous
  5. contrary to your interests or welfare; "adverse circumstances"; "made a place for themselves under the most untoward conditions"
       Synonyms: adverse inauspicious untoward
  6. tending to cause great harm
       Synonyms: evil injurious


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