不正当的、非法的途径和办法illicit means(plural)

• 在成为主流厂商之前，TCL的“野路子”并不好走。

  Before becoming a mainstream manufacturer, TCL found that it was not easy to use illicit means.

• 医生不少是“野路子”出身，没有经过职业训练。

  Many doctors got where they are through illicit means, and have not undergone professional training.