凹凸

Adjective

 * 1) uneven; bumpy; rugged
 * 2)  concavo-convex
 * 1)  concavo-convex

Etymology
→ → * →  →  →

Ultimately from. Appears in texts from at least the 1600s.

Noun

 * 1) that which has a non-flat surface; uneven, bumpy