Denshi Jisho — Online Japanese dictionary

鈍 どん dull; slow; stupid; dull-brained
Na-adjective, Noun 
鈍 のろ dull; slow; stupid; dull-brained
Na-adjective, Noun 
鈍化 どんか becoming dull; slowing down
Common word, Noun, Suru verb 
鈍器 どんき blunt weapon
Common word, Noun 
鈍い にぶい 1: dull (e.g. a knife); blunt;
2: thickheaded; obtuse; stupid;
3: dull (sound); dim (light);
4: slow; sluggish; inert; lethargic
Common word, Adjective 
鈍る にぶる to become less capable; to grow dull; to become blunt; to weaken
Common word, Godan verb with ru ending, Intransitive verb 
鈍い のろい 1: thickheaded; obtuse; stupid;
2: slow; sluggish; inert; lethargic;
3: indulgent (esp. to the opposite sex); doting
Common word, Adjective 
鈍間 のろま blockhead; dunce; gullible (person)
Common word, Na-adjective, Noun 
鈍い おそい 1: slow;
2: late (e.g. "late at night");
3: too late;
4: (Archaism) dull; stupid
Adjective 
鈍甲 どんこ dark sleeper (species of sleeper goby, Odontobutis obscura)
Noun, Usually written using kana alone 
鈍子 どんす silk damask; satin damask
Noun 
鈍麻 どんま torpor
Noun, Suru verb 
鈍る なまる to become less capable; to grow dull; to become blunt; to weaken
Godan verb with ru ending, Intransitive verb 
鈍 なまくら 1: (Usually written using kana alone) blunt (e.g. sword); dull;
2: lazy; cowardly; good for nothing
Na-adjective 
鈍感 どんかん thickheadedness; stolidity; insensitivity
Common word, Na-adjective, Noun 
鈍角 どんかく obtuse angle
Noun, No-adjective 
鈍行 どんこう ordinary train; slow train
Noun, No-adjective 
鈍根 どんこん slow-witted
Na-adjective, Noun 
鈍才 どんさい stupidity; dull person; dullness
Noun 
鈍足 どんそく slow-footed
Noun 
鈍痛 どんつう dull pain
Noun 
鈍刀 どんとう dull or blunt sword
Noun 
鈍頭 どんとう obtuse (of the shape of a leaf); rounded
Noun, No-adjective 
鈍物 どんぶつ blockhead; a fool
Noun 
鈍色 にびいろ dark gray; dark grey
Noun, No-adjective 
鈍ちん にぶちん dullard (gen. from not picking up on other people's feelings)
Noun, Usually written using kana alone 
鈍チン にぶチン dullard (gen. from not picking up on other people's feelings)
Noun, Usually written using kana alone 
鈍らす にぶらす to blunt; to dull; to weaken
Godan verb with su ending, Transitive verb 
鈍重 どんじゅう dullness; bovinity; thickheaded; slow-witted
Na-adjective, Noun 
鈍臭い どんくさい slow (opposite of fast); stupid; irritating
Adjective 
鈍い音 にぶいおと thick sound
Noun 
鈍黄色 にぶきいろ dull yellow
Noun 
鈍臭い のろくさい slow (opposite of fast); stupid; irritating
Adjective 
鈍い男 にぶいおとこ dullard; dolt
Noun 
鈍角三角形 どんかくさんかくけい obtuse triangle
Noun 

Found 35 words.

You can also

Look up kanji details for 鈍.

Try a Yahoo Jisho search for 鈍 .
Try a Goo Jisho search for 鈍 .
Try a Google search for 鈍 .