► 動詞
抜ける [ぬける] [抜けている] [coll] meaning: stupid rank: 2
☆ 彼は少し抜けている ⇨ He is not all there, a little slow, lacks common sense
惚ける [(2)ぼける] meaning: stupid rank: 2
☆ ボケた面した奴 ⇨ A guy with a dumb face
☆ ボケてんじゃねえぞ、てめえ ⇨ Stop being so dumb, your idiot
戯ける [たわける] [liter] meaning: stupid rank: 4
☆ 戯けた事を抜かすな！ ⇨ Cut your crap!
► 成句
間 [ま] [間が抜ける] meaning: stupid rank: 1
☆ 彼はどうも間が抜けている ⇨ He is not really all there. He is absent-minded, scatterbrained
☆ 政府も今頃対策に乗り出すなんて間が抜けた話だ ⇨ It is stupid that the government is taking actions at this late stage
► 名詞
頭 [(2)あたま] [頭が悪い] [coll] meaning: stupid rank: 1
☆ お前頭わりいな ⇨ You are dumb (☛ “わりい” is a colloquial form of “悪い”)
馬鹿 [(1)ばか] meaning: stupid rank: 1
☆ バーカ！ ⇨ You idiot!
アホ [(2)あほ] [coll] [peer] meaning: stupid rank: 2
☆ お前アホか？ ⇨ Are you stupid? (☛ Originally a western dialect. Because of the influence of Osaka comedians it has a somewhat lighter tone than バカ)
蛸 [(1)たこ] [coll] [contempt] meaning: stupid rank: 2
☆ このタコが！ ⇨ You moron!
馬鹿野郎 [(4)ばかやろう] [coll] [contempt] meaning: stupid rank: 2
☆ この馬鹿野郎！ ⇨ You idiot!
☆ 馬鹿野郎、いい加減にしろ！ ⇨ Cut your crap, your moron!
惚け [(1)ぼけ] [coll] [contempt] meaning: stupid rank: 2
☆ うるせえ、ボケ！ ⇨ Shut up, you moron!
惚け [(1)ぼけ] [coll] meaning: stupid rank: 2
☆ 漫才のボケ役 ⇨ (☛ Traditional Japanese stand-up comedian pairs consist of an aggressive person and a person who plays dumb)
間抜け [まぬけ] meaning: stupid rank: 2
☆ この大間抜けが！ (おおまぬけ) ⇨ You idiot! (☛ Literally “missing a gap”. Careless, not aware, not sharp)
阿呆 [(2)あほう] meaning: stupid rank: 3
☆ 踊る阿呆に見る阿呆、同じ阿呆なら踊らにゃ損損 ⇨ Dancing fools and watching fools. Fools either way, so you’d rather dance (☛ A lyrics of Awa Dance, a famous traditional dance festival in Tokushima city)
愚かさ [(3)おろかさ] [liter] meaning: stupid rank: 3
☆ 人間の愚かさは限りが無い ⇨ The stupidity of humans is endless
糞っ垂れ [くそったれ] [coll] [vulgar] [男] meaning: stupid rank: 3
☆ あのクソッタレ野郎が！ ⇨ That shithead! (☛ Literally “one who shits”)
戯け [たわけ] [liter] meaning: stupid rank: 3
☆ このたわけ者が！ ⇨ You fool!
あんぽんたん [(5)あんぽんたん] [coll] [humorous] meaning: stupid rank: 4
☆ このあんぽんたんが！ ⇨ You idiot!
薄ら馬鹿 [(4)うすらばか] meaning: stupid rank: 4
☆ この薄ら馬鹿が！ ⇨ You fucking moron! (☛ A stronger form of 馬鹿)
おたんこなす [(5)おたんこなす] [coll] [humorous] meaning: stupid rank: 4
☆ あのおたんこなすが！ ⇨ That moron!
衆愚 [しゅうぐ] meaning: stupid rank: 4
☆ 衆愚政治 ⇨ Ochlocracy. Politics run by stupid mass
白痴 [はくち] [liter] meaning: stupid rank: 4
☆ 彼女は重度の白痴だ ⇨ She has severe intellectual disability (☛ Used to be a technical term but in disuse now, just like “moron”)
馬鹿垂れ [(3)ばかたれ] [coll] meaning: stupid rank: 4
☆ この馬鹿たれが！ ⇨ You moron!
馬鹿者 [(3)ばかもの] [coll] meaning: stupid rank: 4
☆ この馬鹿者が！ ⇨ You moron!
馬鹿もん [(3)ばかもん] [coll] meaning: stupid rank: 4
☆ この馬鹿もんが！ ⇨ You moron!
ぼけなす [ぼけなす] [coll] [contempt] meaning: stupid rank: 4
☆ このボケナスが！ ⇨ You moron!
盆暗 [ぼんくら] meaning: stupid rank: 4
☆ 盆暗野郎！ ⇨ You idiot! (☛ Incompetent and slow)
与太者 [よたもの] meaning: stupid rank: 4
☆ (☛ A loafer)
与太郎 [よたろう] meaning: stupid rank: 4
☆ あいつは何の役にも立たない与太郎だ ⇨ He is a useless ne’er-do-well (☛ A loafer)
► 形容詞
下らない [くだらない] meaning: stupid rank: 1
☆ くだらない冗談を言うな ⇨ Cut your silly jokes
☆ 彼はくだらない事に金を無駄遣いしている ⇨ He is wasting his money on stupid, useless, things
詰まらない [(3)つまらない] meaning: stupid rank: 2
☆ 折角頑張って来たのにここで諦めたのではつまらない ⇨ We’ve worked so hard, so it would be kind of stupid to give up here now
► 形容動詞
馬鹿 [(1)ばか] meaning: stupid rank: 1
☆ なんてバカな事をしてしまったんだろう！ ⇨ What a stupid thing I did!
☆ なんてバカな奴だ！ ⇨ What a stupid guy!
愚か [(1)おろか] [liter] meaning: stupid rank: 2
☆ この愚か者が！ ⇨ You stupid!
☆ 人間とはどうしてこうも愚かなのだろう ⇨ Why are humans so stupid?
どじ [(1)どじ] [coll] [peer] meaning: stupid rank: 2
☆ あんたはホントにドジなんだから！ ⇨ You’re such a klutz! (☛ Someone who has no malice, but not sharp, smooth and makes dumb mistakes)
馬鹿みたい [(1)ばかみたい] [coll] meaning: stupid rank: 2
☆ 正直に間違いを認めた私だけが罰せられて馬鹿みたいだ ⇨ I feel stupid to be the only one to get punished for admitting a mistake honestly
間抜け [まぬけ] meaning: stupid rank: 2
☆ 盗みに入った家で寝ている所を捕まった間抜けな泥棒 ⇨ A stupid burglar who got arrested while sleeping in the house he had broken in (☛ Literally “missing a gap”. Careless, not aware, not sharp)
浅はか [(2)あさはか] meaning: stupid rank: 3
☆ 簡単に煽てに乗る浅はかな奴 ⇨ A shallow and stupid guy who gets easily manipulated with flattery (☛ Stupid because of shallowness)
低能 [ていのう] meaning: stupid rank: 3
☆ 私は学校で教師に低能扱いされた ⇨ At school teachers treated me like a moron
とんま [(1)とんま] [coll] [contempt] meaning: stupid rank: 3
☆ なんてとんまな奴だ ⇨ What a stupid guy
単細胞 [(3)たんさいぼう] [coll] meaning: stupid rank: 4
☆ あいつは単細胞だ ⇨ He’s made of a single cell. He’s really stupid
盆暗 [ぼんくら] meaning: stupid rank: 4
☆ なんて盆暗な奴だ ⇨ What a useless guy he is (☛ Incompetent and slow)
► 接頭辞
惚け [(1)ぼけ] [coll] [contempt] meaning: stupid rank: 2
☆ あのボケ爺！ ⇨ That fucking senile old fart! (☛ Senile)
► 連体詞
惚けた [(2)とぼけた] meaning: stupid rank: 4
☆ 惚けた事を言うな ⇨ Cut your crap!