1. 無(wú)害的;（尤指對健康）不造成傷害的 Something that is harmless does not have any bad effects, especially on people's health.
e.g. Industry has been working at developing harmless substitutes for these gases... 該行業(yè)一直在努力開(kāi)發(fā)一些可以替代這些氣體的無(wú)害物質(zhì)。 e.g. This experiment was harmless to the animals. 這個(gè)試驗不會(huì )對動(dòng)物造成傷害。
harmlessly Another missile exploded harmlessly outside the town. 又一枚導彈在城外爆炸，沒(méi)有造成任何傷害。
2. 無(wú)關(guān)緊要的;不討人厭的;不會(huì )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.
e.g. He seemed harmless enough... 他看起來(lái)不會(huì )惹什么麻煩。 e.g. I would not want to deny them a harmless pleasure. 我不想剝奪他們這點(diǎn)無(wú)傷大雅的樂(lè )趣。
harmlessly It started harmlessly enough, with a statement from the Secretary of State for Social Security. 開(kāi)始時(shí)并沒(méi)有什么重要內容，由社會(huì )保障大臣作了一個(gè)發(fā)言。