gentle, graceful, slight, smooth | sharp, tight
The road went round in a tight curve.

wide | sensual, voluptuous
the voluptuous curve of her hips

downward, upward

form, make
The seats were arranged to form a curve.

in a ~
The road follows the coast in a wide curve.

gently, slightly
a gently curving stream

away, down, up
The path curved down towards the village.

around/round, towards, etc.
The road curved away round the back of the hill.