| 500 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 600 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 572 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 134 | A New Dictionary of Kanji Usage |
| 17 | Classic Nelson (Andrew Nelson) |
| 130 | Essential Kanji (P.G. O’Neill) |
| 104 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 94 | Japanese Names (P.G. O’Neill) |
| 3.18 | Japanese for Busy People |
| 94 | Kanji and Kana (Spahn and Hadamitzky) |
| 94 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 422 | Kanji in Context (Nishiguchi and Kono) |
| 10 | Kodansha Compact Kanji Guide |
| 4242 | Kodansha Kanji Dictionary (Jack Halpern) |
| 2141 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 2890 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1225 | Les Kanjis dans la tete (Yves Maniette) |
| 19 | Morohashi |
| 3434 | New Japanese English Character Dictionary (Jack Halpern) |
| 13 | New Nelson (John Haig) |
| 1217 | Remembering The Kanji (James Heisig) |
| 1302 | Remembering The Kanji, 6th edition (James Heisig) |
| 103 | The Kanji Way to Japanese Language Power (Dale Crowley) |
| 444 | Tuttle Kanji Cards (Alexander Kask) |
Jōyō kanji, taught in grade 4
JLPT level N4
101 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 不 【フ】 un-, non-, negative prefix
- 不安 【フアン】 anxiety, uneasiness, worry, apprehension, fear, insecurity, suspense
- 意味不 【イミフ】 of uncertain meaning, ambiguous, cryptic, nonsensical, incomprehensible, perplexing
- 社不 【シャフ】 person unfit for society, misfit
- 無 【ブ】 un-, non-, bad ..., poor ...
- 不気味 【ブキミ】 weird, eerie, ominous, creepy, uncanny, unearthly
Readings
- Korean:
- bu, bul
Spanish
- prefijo negativo: in-
- des-
Portuguese
- Prefixo negativo
- negativa
- não
- feia
- ruim
- deselegante
French
- négation
- non
- mauvais
- laid
- maladroit
| 3154 | 2001 Kanji |
| 0a4.2 | The Kanji Dictionary |
| 4-4-1 | SKIP code |
| 3-3-1 | SKIP code |
| 3-2-2 | SKIP code |
| 1090.0 | Four corner code |
| 1-41-52 | JIS X 0208-1997 kuten code |
| 4e0d | Unicode hex code |
Jōyō kanji, taught in grade 3
JLPT level N4
309 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 急 【キュウ】 sudden, abrupt, unexpected, urgent, pressing, steep, sharp, precipitous, rapid, swift, fast, emergency, crisis, danger, urgency, hurrying, haste, (in gagaku or noh) end of a song
- 急遽 【キュウキョ】 hurriedly, in a hurry, hastily, in haste, sudden, abrupt
- 準急 【ジュンキュウ】 semi-express train, local express train, sub-express train
- 快急 【カイキュウ】 rapid express (train)
Kun reading compounds
- 急ぐ 【いそぐ】 to hurry, to rush, to hasten, to make something happen sooner
- 急ぎ 【いそぎ】 haste, hurry, expedition, speed, dispatch
- 急ぎ足 【いそぎあし】 fast pace, quick pace
- 急く 【せく】 to hurry, to rush
Readings
- Korean:
- geub
Spanish
- prisa
- urgencia
- apresurarse
- darse prisa
Portuguese
- apressar
- emergência
- repentina
French
- urgence
- se dépêcher
- soudain
- raide
- abrupt
- aigu
| 186 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 272 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 254 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 275 | A New Dictionary of Kanji Usage |
| 1667 | Classic Nelson (Andrew Nelson) |
| 330 | Essential Kanji (P.G. O’Neill) |
| 174 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 2.11 | Japanese for Busy People |
| 303 | Kanji and Kana (Spahn and Hadamitzky) |
| 303 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 260 | Kanji in Context (Nishiguchi and Kono) |
| 775 | Kodansha Compact Kanji Guide |
| 2595 | Kodansha Kanji Dictionary (Jack Halpern) |
| 1328 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 1800 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1155 | Les Kanjis dans la tete (Yves Maniette) |
| 10475X | Morohashi |
| 2092 | New Japanese English Character Dictionary (Jack Halpern) |
| 1823 | New Nelson (John Haig) |
| 1146 | Remembering The Kanji (James Heisig) |
| 1229 | Remembering The Kanji, 6th edition (James Heisig) |
| 322 | Tuttle Kanji Cards (Alexander Kask) |
| 2558 | 2001 Kanji |
| 2n7.2 | The Kanji Dictionary |
| 2-2-7 | SKIP code |
| 2-5-4 | SKIP code |
| 2733.7 | Four corner code |
| 1-21-62 | JIS X 0208-1997 kuten code |
| 6025 | Unicode hex code |