凹凸不平 āo tū bù píng

DEFINITIONS

  1. uneven (surface)
  2. bumpy (road)

CHARACTERS

凹 āo
HSK 6
concave, hollow, depressed; a pass, valley
凸 tū
HSK 6
protrude, bulge out, convex
不 bù
HSK 1
no, not; un-; negative prefix
平 píng
HSK 3
flat, level, even; peaceful