WordWeb Online

1. Highly complex or intricate and occasionally devious
   "tortuous legal procedures";
   - Byzantine, convoluted, involved, knotty, tangled, labyrinthine
    
2. Marked by repeated turns and bends
   "a tortuous road up the mountain";
   - twisting, twisty, winding, voluminous, windy[2]
    
3. Not straightforward
   "his tortuous reasoning"

Sounds like: tor

See also: complex, crooked, indirect

Encyclopedia: Tortuous