Aduncity refers to a curved or hooked shape. Some synonyms for aduncity include curvature, crookedness, bend, arch, hook, and twist. Curvature refers to the general shape of something that is not straight, while crookedness specifically refers to something that is twisted or bent out of shape. Bend and arch both refer to a curve in a more fluid, flowing way. Hook refers to a sharp curve or angle, usually at the end of something. Twist refers to a more angular and sudden curve or turn. All of these words can be used to describe the shape of something that is not straight.