- a baffling problem.
- a knobbed stick.
- a knotty problem.
- a mass of knotted string.
- a problematic situation at home.
- Byzantine methods for holding on to his chairmanship.
- convoluted legal language.
- convoluted reasoning.
- gnarled and knotted hands.
- got his way by labyrinthine maneuvering.
- I faced the knotty problem of what to have for breakfast.
- Oh, what a tangled web we weave.
- snarled thread.
- the Byzantine tax structure.
- the plot was too involved.
- tortuous legal procedures.
- tortuous negotiations lasting for months.