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'harmful' - used as an adjective
1. injurious to physical or mental health
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
4. constituting a disadvantage
5. contrary to your interests or welfare
6. tending to cause great harm
See also
  • harmless
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    Fact of the day
    The range of a medieval long-bow is 220 yards.