1) Contortion 2) Crookedness 3) Differential geometry 4) Distorted shape 5) Distortion 6) Torsion 7) Tortuousness 1) Convolution 2) Crookedness 3) Maze 4) Torsion 5) Tortuousness 
Tortuosity is a property of curve being tortuous (twisted; having many turns). There have been several attempts to quantify this property. Tortuosity is commonly used to describe diffusion in porous media, such as soils and snow. ==Tortuosity in 2-D== Subjective estimation (sometimes aided by optometric grading scales) is often used. Arc-chord rat...
[n] - a tortuous and twisted shape or position
tortuousness noun a tortuous and twisted shape or position; `they built a tree house in the tortuosities of its boughs`; `the acrobat performed incredible contortions`