凹 — Concave / Hollow / Sunken

Master (高手)おう, くぼ, へこ, ぼこ

Radical ⼐ · radical 17 The building block this kanji is filed under

凹 (readings: おう, くぼ, へこ, ぼこ; Japanese kanji) means “Concave / Hollow / Sunken”. It is a Jōyō kanji taught in Japanese secondary school (junior & senior high) — the 高手 · Master tier beyond the grade 1–6 Kyōiku set, and appears in words such as 凹凸 (unevenness).

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What does 凹 mean?

Full details, readings & example

Kanji	凹
Meaning	Concave / Hollow / Sunken
Readings	おう, くぼ, へこ, ぼこ
Grade	Master (高手 · secondary school)
Curriculum	Jōyō kanji · Japanese secondary school (JLPT N1–N2)
Example	凹凸 (unevenness)

How to read 凹

凹 is read おう or くぼ or へこ or ぼこ depending on the word.

Words with 凹

凸凹lồi lõm
凹凸lồi lõm

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Updated: 2026-07-22