Definition of harmless adjective from the Oxford Advanced American Dictionary

      

    harmless

     adjective
    adjective
    NAmE//ˈhɑrmləs//
     
     
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  1. 1harmless (to somebody/something) unable or unlikely to cause damage or harm The bacteria is harmless to humans.
  2. 2unlikely to upset or offend anyone synonym innocuous It's just a little harmless fun.
 
adverb The missile fell harmlessly into the ocean. His interest in guns started harmlessly enough, but later it became an obsession.
harmlessness
 
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noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: harmless