• 鈍器どんき

  blunt weapon

• 鈍化どんか

  becoming dull, slowing down

• 鈍感どんかん

  thickheaded, insensitive, dull, thick-skinned

• 鈍間のろま

  blockhead, dunce, dimwit, dolt, slowcoach, slowpoke

• 鈍るにぶる

  to become blunt, to grow dull

• 鈍いのろい

  thickheaded, obtuse, stupid

• 鈍いにぶい

  dull (e.g. a knife), blunt

• 鈍どん

  dull, slow, stupid, dull-brained

• 鈍すなます

  to anneal

• 鈍痛どんつう

  dull pain

• 鈍根どんこん

  slow-witted

• 鈍足どんそく

  slow-footed

• 鈍角どんかく

  obtuse angle

• 鈍行どんこう

  local train, slow train

• 鈍臭のろくさ

  slowly, sluggishly

• 鈍物どんぶつ

  blockhead, a fool

• 鈍刀どんとう

  dull or blunt sword

• 鈍麻どんま

  becoming numb, becoming desensitized

• 鈍才どんさい

  stupidity, dull person, dullness

• 鈍頭どんとう

  obtuse (of the shape of a leaf), rounded

• 鈍色にびいろ

  dark gray, dark grey

• 鈍磨どんま

  becoming dull (of a knife, one's wits, etc.), becoming blunt

• 鈍甲どんこ

  dark sleeper (species of sleeper goby, Odontobutis obscura)

• 鈍らなまくら

  blunt (e.g. sword), dull

• 鈍重どんじゅう

  thickheaded, slow-witted, phlegmatic, stolid, bovine

• 薄鈍うすのろ

  half-wit, fool, simpleton

• 愚鈍ぐどん

  stupid, dim-witted, dense, dull, obtuse, slow

• 遅鈍ちどん

  dullness, stupidity

• 利鈍りどん

  sharp or blunt, bright or foolish

• 痴鈍ちどん

  dull-witted

• 魯鈍ろどん

  imbecility, stupidity

• 青鈍あおにび

  grey tinged with green, grey tinged with blue

• 駑鈍どどん

  dull-witted, stupid, foolish

• 焼鈍しょうどん

  annealing

• 鈍間猿のろまざる

  loris

• 鈍黄色にぶきいろ

  dull yellow

• 鈍らすにぶらす

  to blunt, to dull, to weaken

• 鈍い音にぶいおと

  dull sound, muffled sound

• 鈍臭いのろくさい

  frustratingly slow

• 鈍するどんする

  to become dim-witted, to lose one's edge, to become insensitive

• 鈍ちんにぶちん

  dullard (gen. from not picking up on other people's feelings)

• 鈍感力どんかんりょく

  The Power of Insensitivity (book by Junichi Watanabe)

• 運根鈍うんこんどん

  luck, steadfastness and patience (the three keys to achieving success)

• 鈍くさいどんくさい

  slow, clumsy, slow-witted, stupid

• 腕が鈍るうでがにぶる

  to become less capable

• 頭の鈍いあたまのにぶい

  dim-witted, airheaded, bird-brained, dim, dullard, blockheaded

• 妻鈍ジーさいのろジー

  uxoriousness, being easy on one's wife, man who is easy on his wife

• 勘が鈍るかんがにぶる

  to become insensitive, to become less perceptive, to lose one's touch, to get out of practice

• 鈍角三角形どんかくさんかくけい

  obtuse triangle

• 決心が鈍るけっしんがにぶる

  to waver in one's resolution