tortuousness       
noun [ U ] uk/ˈtɔː.tʃu.əs.nəs/ us/ˈtɔːr.tʃu.əs.nəs/
 转弯抹角;弯曲
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。 
 See: tortuous
 - More examples
 - The sheer tortuousness of the bureaucracy creates a seemingly impenetrable wall.
 - The whole of this speech is remarkable for tortuousness of arrangement, and round-about expression.
 - the tension and tortuousness of family relationships