Tortuous

/ˈtɔːr.tʃu.əs/ adjective hard

A tortuous path or process winds and bends so much that it becomes difficult to follow or complete directly.

The tortuous mountain road forced drivers to slow to a crawl around each hairpin turn.

Memory Trick

Tortuous looks like 'tortoise' - picture a winding trail so twisted that even a tortoise would have trouble following it straight.