曲折

Adjective

 * 1)  winding; tortuous; twisting and turning
 * 2)  complicated; convoluted; tortuous; having many twists and turns

Noun

 * 1) a thing which twists and turns
 * 2) a change in state
 * 3) complicated circumstances; the details of said circumstances

Verb

 * 1) to twist and turn
 * 2) to change state