| 1671 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) | 
| 1731 | A New Dictionary of Kanji Usage | 
| 4830 | Classic Nelson (Andrew Nelson) | 
| 1388 | Essential Kanji (P.G. O’Neill) | 
| 975 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) | 
| 1943 | Japanese Names (P.G. O’Neill) | 
| 966 | Kanji and Kana (Spahn and Hadamitzky) | 
| 997 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) | 
| 1372 | Kanji in Context (Nishiguchi and Kono) | 
| 1811 | Kodansha Compact Kanji Guide | 
| 2123 | Kodansha Kanji Dictionary (Jack Halpern) | 
| 1108 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) | 
| 1507 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) | 
| 1509 | Les Kanjis dans la tete (Yves Maniette) | 
| 40219 | Morohashi | 
| 1689 | New Japanese English Character Dictionary (Jack Halpern) | 
| 6235 | New Nelson (John Haig) | 
| 1495 | Remembering The Kanji (James Heisig) | 
| 1611 | Remembering The Kanji, 6th edition (James Heisig) | 
| 1597 | Tuttle Kanji Cards (Alexander Kask) | 
      Jōyō kanji, taught in junior high
    
    
      JLPT level N2
    
    
      1574 of 2500 most used kanji in newspapers
    
Stroke order
On reading compounds
- 鈍 【ドン】 dull, slow, stupid, dull-brained
 - 鈍化 【ドンカ】 becoming dull, slowing down
 - 焼鈍 【ショウドン】 annealing
 - 愚鈍 【グドン】 stupid, dim-witted, dense, dull, obtuse, slow
 
Kun reading compounds
- 鈍い 【にぶい】 dull (e.g. a knife), blunt, thickheaded, obtuse, stupid, dull (sound, color, etc.), dim (light), slow, sluggish, inert, lethargic, insensitive, dull (e.g. reflexes), unperceptive, unfeeling
 - 鈍い音 【にぶいおと】 dull sound, muffled sound
 - 鈍る 【にぶる】 to become blunt, to grow dull, to become less capable, to weaken, to falter
 - 鈍る 【にぶる】 to become blunt, to grow dull, to become less capable, to weaken, to falter
 - 鈍ら 【なまくら】 blunt (e.g. sword), dull, lazy, cowardly, good for nothing
 
Readings
- Korean:
 - dun
 
Spanish
- torpe
 - pesado
 - embotado
 - obtuso
 - embotarse
 - atascarse
 
Portuguese
- tolo
 - lento
 - estúpido
 - embotado
 - sem corte
 
French
- émoussé
 - lent
 - bête
 
| 2856 | 2001 Kanji | 
| 8a4.2 | The Kanji Dictionary | 
| 1-8-4 | SKIP code | 
| 8511.7 | Four corner code | 
| 1-38-63 | JIS X 0208-1997 kuten code | 
| 920d | Unicode hex code |