凹 concave, hollow, sunken 5 strokes jōyō, taught in secondary school old JLPT 1 #2206 in newspapers Readings Onオウ Kunくぼ.む、へこ.む、ぼこ In Chinese 凹 Words written with it 凸凹 でこぼこ unevenness N2 凹む へこむ to be dented N2 凹凸 おうとつ unevenness 凹み くぼみ hollow