frictionless

/ˈfrɪkʃnləs/ 9
not impeded by or creating friction; smooth. "a compass needs to have a lightweight magnet and a frictionless bearing"

adjective [原级]无摩擦的;光滑的

Our cheap, ultra-reliable wired networks made credit-card authentication over the phone frictionless.
我们实惠的、非常可靠的有线网络使通过电话进行信用卡认证变得轻而易举。

frictionless

-less ⌜ 表示缺乏或没有某种特性 - indicating the absence or lack of a particular quality ~ ⌟
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In reality job change is seldom so frictionless. 而实际上就业变化很少是这么一帆风顺的。
A perpetual motion machine would have to be frictionless. 永动机只能是一种无摩擦力的机器。