concave, hollow, sunken

Radicals

Common words

• 凹凸【おうとつ】
  unevenness, bumpiness, roughness, ruggedness, imbalance, inequality, unevenness, disparity
• 凸凹【でこぼこ】
  unevenness, roughness, ruggedness, bumpiness, inequality, imbalance, unevenness, difference