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
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