IPA: /ˈtwɪstɪə/
KK: /ˈtwɪstɪər/
Having more twists or turns than something else.
The road became twistier as we drove through the mountains.
Twistier → It is formed from "twist" (from Old English *twistian*, meaning to twist or turn) and the comparative suffix "-ier" (meaning more). The word "twistier" means more twisted or having a greater degree of twist.
Think of the Old English word for twisting, and remember that "twistier" means something that is more twisted.