| 1184 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 1884 | A New Dictionary of Kanji Usage |
| 1730 | Classic Nelson (Andrew Nelson) |
| 1496 | Essential Kanji (P.G. O’Neill) |
| 1308 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 2032 | Japanese Names (P.G. O’Neill) |
| 1642 | Kanji and Kana (Spahn and Hadamitzky) |
| 1755 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 1701 | Kanji in Context (Nishiguchi and Kono) |
| 793 | Kodansha Compact Kanji Guide |
| 3513 | Kodansha Kanji Dictionary (Jack Halpern) |
| 1813 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 2467 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1976 | Les Kanjis dans la tete (Yves Maniette) |
| 10946X | Morohashi |
| 2834 | New Japanese English Character Dictionary (Jack Halpern) |
| 1925 | New Nelson (John Haig) |
| 1957 | Remembering The Kanji (James Heisig) |
| 2107 | Remembering The Kanji, 6th edition (James Heisig) |
| 1623 | Tuttle Kanji Cards (Alexander Kask) |
Jōyō kanji, taught in junior high
JLPT level N1
1551 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 愚 【グ】 foolishness, silliness, stupidity, folly, I, me
- 愚痴 【グチ】 idle complaint, grumble, moha (ignorance, folly)
- 軽愚 【ケイグ】 moronity, moron
- 大愚 【タイグ】 great folly or fool
Kun reading compounds
- 愚か 【おろか】 foolish, stupid, silly
- 愚かしい 【おろかしい】 foolish, stupid
Readings
- Korean:
- u
Spanish
- estupidez
- tontería
- prefijo humilde para cosas propias
Portuguese
- tolo
- tolice
- disparate
- estúpidez
French
- stupide
- absurdité
- idiot
- bête
| 3658 | 2001 Kanji |
| 4k9.15 | The Kanji Dictionary |
| 2-9-4 | SKIP code |
| 2-8-4 | SKIP code |
| 6033.2 | Four corner code |
| 1-22-82 | JIS X 0208-1997 kuten code |
| 611a | Unicode hex code |
Jōyō kanji, taught in grade 2
JLPT level N4
1161 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 弟 【オトウト】 younger brother, little brother, kid brother, brother-in-law (spouse's younger brother or younger sister's husband), pupil, apprentice
- 弟子 【デシ】 pupil, disciple, adherent, follower, apprentice, young person, teacher's student-helper
- 実弟 【ジッテイ】 biological younger brother
- 子弟 【シテイ】 children, sons, children and younger brothers, young people
- 親兄弟 【オヤキョウダイ】 parents and siblings, one's relatives
- 姉弟 【シテイ】 older sister and younger brother
- 弟子 【デシ】 pupil, disciple, adherent, follower, apprentice, young person, teacher's student-helper
- 弟子入り 【デシイリ】 becoming a pupil (of), becoming an apprentice
Kun reading compounds
- 弟 【おとうと】 younger brother, little brother, kid brother, brother-in-law (spouse's younger brother or younger sister's husband), pupil, apprentice
- 弟君 【おとうとぎみ】 younger brother
Readings
- Japanese names:
- て
- Korean:
- je
Spanish
- hermano menor
Portuguese
- irmão mais jovem
French
- frère cadet
- apprenti
- disciple
- service déférent aux ainés
| 282 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 194 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 177 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 1090 | A New Dictionary of Kanji Usage |
| 584 | Classic Nelson (Andrew Nelson) |
| 446 | Essential Kanji (P.G. O’Neill) |
| 168 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 764 | Japanese Names (P.G. O’Neill) |
| 3.8 | Japanese for Busy People |
| 405 | Kanji and Kana (Spahn and Hadamitzky) |
| 409 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 76 | Kanji in Context (Nishiguchi and Kono) |
| 607 | Kodansha Compact Kanji Guide |
| 2537 | Kodansha Kanji Dictionary (Jack Halpern) |
| 1291 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 1759 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1248 | Les Kanjis dans la tete (Yves Maniette) |
| 9737 | Morohashi |
| 2044 | New Japanese English Character Dictionary (Jack Halpern) |
| 1685 | New Nelson (John Haig) |
| 1240 | Remembering The Kanji (James Heisig) |
| 1328 | Remembering The Kanji, 6th edition (James Heisig) |
| 150 | Tuttle Kanji Cards (Alexander Kask) |
| 944 | 2001 Kanji |
| 2o5.1 | The Kanji Dictionary |
| 2-2-5 | SKIP code |
| 4-7-3 | SKIP code |
| 8022.7 | Four corner code |
| 1-36-79 | JIS X 0208-1997 kuten code |
| 5f1f | Unicode hex code |