a knotty problem.
a tortuous road up the mountain.
Byzantine methods for holding on to his chairmanship.
convoluted legal language.
convoluted reasoning.
got his way by labyrinthine maneuvering.
had to steer the car down a twisty track.
his tortuous reasoning.
Oh, what a tangled web we weave.
the Byzantine tax structure.
the plot was too involved.
tortuous legal procedures.
tortuous negotiations lasting for months.
winding roads are full of surprises.