# 凹 — concave

凹 means “concave”. It is a JLPT N1 kanji written with 5 strokes. On'yomi: オウ (ou). Kun'yomi: へこ(む) (hekomu), ぼこ (boko). You'll see it in words such as 凹む (hekomu, “to be dented; to be indented”).

- Meaning: concave
- On'yomi: オウ (ou)
- Kun'yomi: へこ(む) (hekomu), ぼこ (boko)
- Strokes: 5
- Level: JLPT N1 · set Shapes 3

## Words with 凹

| Word | Reading | Meaning |
| --- | --- | --- |
| 凹む | へこむ (hekomu) | to be dented; to be indented |

## More in the “Shapes 3” set

[凸](https://moji.ninja/n1-kanji/convex/) · [斑](https://moji.ninja/n1-kanji/spot/) · [凹](https://moji.ninja/n1-kanji/concave/) · [弧](https://moji.ninja/n1-kanji/arc/) · [勾](https://moji.ninja/n1-kanji/gradient/) · [塑](https://moji.ninja/n1-kanji/model-in-clay/)

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From Moji Ninja (https://moji.ninja/), a free app for learning hiragana, katakana and the JLPT kanji from N5 to N1 with spaced repetition. Page: https://moji.ninja/n1-kanji/concave/. Last updated 2026-11-01.