無む軌き道どう

na-adjective, noun

trackless; without rails

Literal meaning: lacking tracks or rails. Used for vehicles or systems that do not follow a fixed path.

• 無む軌き道どう電でん車しゃはレールを使つかわずに走はしる。

  A trackless tram runs without using rails.

na-adjective, noun

reckless; dissipated; unrestrained

Figurative extension: acting without moral or social guidelines, often implying a wild or self-indulgent lifestyle.

• 彼かれの無む軌き道どうな生せい活かつは周しゅう囲いを心しん配ぱいさせた。

  His reckless lifestyle worried those around him.