painlessly
🇺🇸
/ˈpeɪnləsli/
🇬🇧
/ˈpeɪnləsli/
without causing pain or discomfort
The doctor removed the splinter painlessly.
医生无痛地取出了木刺。
in an easy and trouble-free manner
The software update installed painlessly.
软件更新安装得非常顺利。