WordWeb Online

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

Sounds like: torturous

See also: complex, crooked, indirect, tortuousness

Encyclopedia: Tortuous