A tortuous road is full of bends and twists. 弯弯曲曲的
adjective [原级] 拐弯抹角的；冗长费解的；弯弯曲曲的，曲折的
The only road access is a tortuous mountain route. 惟一的通路是一条弯弯曲曲的山路。
tort(扭曲) + u + ous(形容词后缀) → 令人身心扭曲的 → 折磨人的
The only road access is a tortuous mountain route. 惟一的通路是一条弯弯曲曲的山路。