1. most perilous
1. He drives full speed along the most perilous of zigzagging mountain roads pursuing criminals.
2. Xiling Gorge is the longest and most perilous stretch, characterized by its many shoals and turbulent water.
3. Such a protectionist move is particularly perilous not only because it will affect trade relations between two of the most important economies in the world.
4. Because the mountainside roads were too perilous for most vehicles, mule caravans became the main means for transporting building materials.