| 1098 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 1678 | A New Dictionary of Kanji Usage |
| 4990 | Classic Nelson (Andrew Nelson) |
| 1718 | Essential Kanji (P.G. O’Neill) |
| 1870 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 1218 | Kanji and Kana (Spahn and Hadamitzky) |
| 1281 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 1522 | Kanji in Context (Nishiguchi and Kono) |
| 730 | Kodansha Compact Kanji Guide |
| 547 | Kodansha Kanji Dictionary (Jack Halpern) |
| 334 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 413 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1325 | Les Kanjis dans la tete (Yves Maniette) |
| 41676P | Morohashi |
| 457 | New Japanese English Character Dictionary (Jack Halpern) |
| 6446 | New Nelson (John Haig) |
| 1315 | Remembering The Kanji (James Heisig) |
| 1412 | Remembering The Kanji, 6th edition (James Heisig) |
| 1401 | Tuttle Kanji Cards (Alexander Kask) |
Jōyō kanji, taught in junior high
JLPT level N1
1154 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 陥落 【カンラク】 subsidence, sinking, cave-in, collapse, falling in, fall (of a city, fortress, etc.), surrender, fall (in position, rank, etc.), demotion, giving in (to someone's persuasion), yielding, being convinced
- 陥没 【カンボツ】 cave-in, collapse, sinking, depression (e.g. of the skull), subsidence
- 擠陥 【セイカン】 tempting into crime
- 注意欠陥 【チュウイケッカン】 attention deficit
Kun reading compounds
- 陥る 【おちいる】 to fall into (e.g. a hole), to fall into (chaos, depression, dilemma, illness, etc.), to fall into (a trap, etc.), to fall, to surrender, to capitulate
- 陥れる 【おとしいれる】 to trap (into a difficult situation), to put (in a fix), to throw (e.g. into turmoil), to trick (into doing), to lure (into a trap), to frame (for a crime), to capture (a castle, fortress, etc.), to take, to reduce, to drop (something) into
Readings
- Korean:
- ham
Spanish
- hundirse
- derrumbarse
- caer
- resbalarse
- deslizarse
Portuguese
- colapso
- desmoronar
- ruir
- queda (castelo)
- deslizamento
French
- s'écrouler
- piège
- tomber dans
- capituler
- tomber (château)
- glisser dans
| 3678 | 2001 Kanji |
| 2d7.11 | The Kanji Dictionary |
| 1-3-7 | SKIP code |
| 7726.2 | Four corner code |
| 1-20-57 | JIS X 0208-1997 kuten code |
| 9665 | Unicode hex code |
凹
Jōyō kanji, taught in junior high
JLPT level N1
2206 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 凹 【オウ】 concave, hollow, sunken
- 凹凸 【オウトツ】 unevenness, bumpiness, roughness, ruggedness, imbalance, inequality, unevenness, disparity
- 肋凹 【ロクオウ】 costal fovea
Kun reading compounds
- 窪む 【くぼむ】 to cave in, to become depressed, to sink
- 凹む 【へこむ】 to be dented, to be indented, to yield, to give, to sink, to collapse, to cave in, to be beaten, to be overwhelmed, to yield, to give in, to give up, to be disheartened, to feel down, to feel depressed, to suffer a loss, to lose
- 発達凸凹 【はったつでこぼこ】 developmental irregularities, developmental disorder, neurodiversity
- 穴ぼこ 【あなぼこ】 hole, hollow, pothole (road, pavement, etc.)
Readings
- Korean:
- yo
Spanish
- hueco
- cóncavo
- hundido
Portuguese
- côncavo
- concavidade
- afundado
French
- concave
- creux
- dépression
| 1032 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 1920 | A New Dictionary of Kanji Usage |
| 664 | Classic Nelson (Andrew Nelson) |
| 1883 | Essential Kanji (P.G. O’Neill) |
| 1087 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 1893 | Kanji and Kana (Spahn and Hadamitzky) |
| 2069 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 1922 | Kanji in Context (Nishiguchi and Kono) |
| 173 | Kodansha Compact Kanji Guide |
| 4294 | Kodansha Kanji Dictionary (Jack Halpern) |
| 2170 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 2924 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 33 | Les Kanjis dans la tete (Yves Maniette) |
| 1810 | Morohashi |
| 3482 | New Japanese English Character Dictionary (Jack Halpern) |
| 444 | New Nelson (John Haig) |
| 33 | Remembering The Kanji (James Heisig) |
| 33 | Remembering The Kanji, 6th edition (James Heisig) |
| 1039 | Tuttle Kanji Cards (Alexander Kask) |
| 3675 | 2001 Kanji |
| 0a5.14 | The Kanji Dictionary |
| 4-5-1 | SKIP code |
| 4-6-1 | SKIP code |
| 4-4-1 | SKIP code |
| 7777.0 | Four corner code |
| 1-17-90 | JIS X 0208-1997 kuten code |
| 51f9 | Unicode hex code |