ETYM Latin flexuosus, from flexus a bending, turning.
Having turns or windings.

ETYM Latin serpentinus: cf. French serpentin.
Resembling a serpent in form; SYN. snaky.

ETYM Latin sinuosus, from sinus a bent surface, a curve: cf. French sinueux. Related to Sinus.
Bending in and out; of a serpentine or undulating form; winding; crooked.

ETYM Cf. French spiral. Related to Spire a winding line.
1. Winding or circling round a center or pole and gradually receding from it.
2. Winding round a cylinder or imaginary axis, and at the same time rising or advancing forward; winding like the thread of a screw; helical.
3. Of or pertaining to a spiral; like a spiral.

ETYM Old Eng. tortuos, Latin tortuosus, from tortus a twisting, winding, from torquere, tortum, to twist: cf. French tortueux. Related to Torture.
1. Marked by repeated turns and bends; SYN. twisting, twisty, winding.
2. Not straightforward.

Wound or wrapped around something; SYN. twisted.

Decorated with a wreath; encircled

With many twists and turns, with many curves

In a tortuous manner.