Something that is harmless does not have any bad effects, especially on people's health.
例句
Industry has been working at developing harmless substitutes for these gases...該行業一直在努力開發一些可以替代這些氣體的無害物質。This experiment was harmless to the animals.這個試驗不會對動物造成傷害。
ADJ-GRADED
無關緊要的;不討人厭的;不會惹麻煩的
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.
例句
He seemed harmless enough...他看起來不會惹什么麻煩。I would not want to deny them a harmless pleasure.我不想剝奪他們這點無傷大雅的樂趣。