Definition of harmless adjective from the Oxford Advanced Learner's Dictionary

      

    harmless

     adjective
    adjective
    BrE BrE//ˈhɑːmləs//
     
    ; NAmE NAmE//ˈhɑːrmləs//
     
     
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  1. 1  harmless (to somebody/something) unable or unlikely to cause damage or harm The bacteria is harmless to humans.
  2. 2  unlikely to upset or offend anyone synonym innocuous It's just a bit of harmless fun.
  3. Extra examples The substance is harmless to people. a small and seemingly harmless creature chemical wastes which have to be rendered harmless Most bacteria are harmless to humans. Safety glass will break into relatively harmless pieces when it is hit hard. Some apparently harmless drugs can be lethal when used in combination.
See the Oxford Advanced American Dictionary entry: harmless