► 副詞
うっかり [(3)うっかり] meaning: careless rank: 1
☆ うっかりして携帯を落としてしまった ⇨ I got careless, wasn’t paying attention, and dropped my cell phone
☆ 彼女は秘密をうっかり喋ってしまった ⇨ She carelessly revealed the secret
► 形容詞
そそっかしい [(2)そそっかしい] meaning: careless rank: 2
☆ 彼はそそっかしくて同じ間違いを何度もする ⇨ He is very careless, scatterbrained, and makes the same mistake again and again (☛ Don’t pay close attention and misunderstand things, and then make mistakes because of that)
► 形容動詞
おっちょこちょい [(6)おっちょこちょい] [coll] [humorous] meaning: careless rank: 2
☆ 彼は大変なおっちょこちょいで忘れ物が多い ⇨ He is really careless and loses things all the time (☛ Typically careless without serious consequences)
迂闊 [うかつ] meaning: careless rank: 3
☆ あの暴力団は強力で警察も迂闊には手を出せない ⇨ The gang is very powerful and even the police cannot handle them carelessly
☆ 彼が迂闊な事を言ったために大事になった ⇨ Things became ugly because he made some careless comments
軽率 [けいそつ] meaning: careless rank: 3
☆ 彼の軽率な行動で計画が台無しになった ⇨ His careless, frivolous, behavior ruined the plan
杜撰 [ずさん] meaning: careless rank: 3
☆ 杜撰な工事のために橋は倒壊した ⇨ The bridge collapsed because of the shoddy construction
☆ 杜撰な経営管理が会社の倒産につながった ⇨ The careless, irresponsible, management of the company has led to bankruptcy (☛ Usually about the way projects, organizations are run)
無造作 [(2)むぞうさ] meaning: careless rank: 3
☆ 彼は箱を無造作に床に置いた ⇨ He tossed the box on the floor with little care (☛ Typically handle something carelessly)
粗雑 [そざつ] meaning: careless rank: 4
☆ 粗雑な作り方の品物 ⇨ A carelessly-made product
不用意 [(2)ふようい] meaning: careless rank: 4
☆ 彼の不用意な発言が相手の不信感を募らせた ⇨ His careless comment made the mistrust of the other side worse