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tortuous (adj) (of a road) full of curves; lengthy and not direct and therefore complicated and difficult to understand.
A road is tortuous if it is full of curves and bends and is therefore difficult to travel along. The course of a river is tortuous if it flows in a zigzag manner. Anything that is not simple and direct, and is therefore complicated and difficult to understand is tortuous.
- The road up the hill was tortuous. The road being full of curves and hairpin bends, we found it difficult to drive.
- His speech was tortuous. It was not simple and straightforward, and so was complicated and difficult to understand.