harmless meaning, harmless definition | English Cobuild dictionary

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1       adj   Something that is harmless does not have any bad effects, especially on people's health.   (=safe)     (Antonym: harmful)    Industry has been working at developing harmless substitutes for these gases..., This experiment was harmless to the animals.     
  harmlessly      adv   ADV with v  
Another missile exploded harmlessly outside the town.     
2       adj   If you describe someone or something as harmless, you mean that they are not important and therefore unlikely to annoy other people or cause trouble.  
He seemed harmless enough..., I would not want to deny them a harmless pleasure.     
  harmlessly      adv   ADV after v  
It started harmlessly enough, with a statement from the Secretary of State for Social Security.     
Translation English Cobuild Collins Dictionary  


gentle, innocent, innocuous, innoxious, inoffensive, nontoxic, not dangerous, safe, unobjectionable  
   dangerous, destructive, harmful, unhealthy, unsafe, unwholesome  

English Collins Dictionary - English synonyms & Thesaurus  

Collaborative Dictionary     English Cobuild
a substance containing a harmless form of the germs that cause a particular disease. It is given to people, usually by injection, to prevent them from getting that disease.
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