painlessly

基本解释

The needles painlessly puncture the skin, but do not go through it.
针头会毫无痛觉地刺进皮肤，但不会刺穿。
Apparently, designers try help users to get the signing procedure as quickly and painlessly as possible.
显然地，设计师试图帮助用户尽可能快速和无痛苦地完成注册流程。
blog.sina.com.cn
Competition and new technology often bring down prices for services like cable, telephone and Internet--giving us an opportunity to cut monthly budget expenses painlessly.
竞争以及新的科技经常会给电视，电话，网络这样的服务行业带来降价，这就提供给我们每月可以毫无痛苦地节省开支的机会。

The truck hits you,you die,painlessly and immediately.
卡车撞到了你，你在无痛中立即死亡。
耶鲁公开课 - 死亡课程节选

The opening five minutes of the first round saw Watson run the board quickly and painlessly.
FORBES: On First Night Watson Went From Fearsome to Flummoxed To First
Most animals are killed (painlessly) when the research they are being used for is finished.
ECONOMIST: Animal rights extremists
Yet the notion that motorists can be persuaded painlessly to switch to public transport is bogus.
ECONOMIST: Traffic