the quality of not being direct or simple, or of having many turns and changes of direction

His speech had a curious mixture of directness and tortuousness. 他的讲话既直接又拐弯抹角，这是很奇特的。

The tortuousness of the roads affected cars more than goods vehicles. 弯弯曲曲的道路对汽车的影响比对货运车辆的影响更大。