For hair:
* Ondulado/a: This is the most common and general term for "wavy" hair.
* Rizado/a: While this means "curly," it can also be used to describe slightly wavy hair.
For other things:
* Ondulado/a: This can also be used to describe something that has a wave-like shape, like a road or a line.
* Curvo/a: This means "curved" and can be used to describe something that is wavy or has a gentle curve.
* Acorrugado/a: This means "corrugated" and can be used to describe something that has a wavy or ridged surface.
Examples:
* Tengo el pelo ondulado. (I have wavy hair.)
* La carretera es ondulada. (The road is wavy.)
* La línea del horizonte está ondulada. (The horizon line is wavy.)
It's important to choose the right word based on the specific context.