► 副詞
一体 [いったい] [coll] meaning: in the world rank: 1
☆ 一体どうすれば良いんだ? ⇨ What the hell am I supposed to do?
☆ 一体何がどうなってるんだ? ⇨ What the hell is going on here?
☆ 一体何の話だ? ⇨ What the hell are you talking about?
► 名詞
一体 [いったい] meaning: one rank: 3
☆ 彼らはエンジンとギアボックスを一体化した ⇨ They integrated an engine and gearbox in one unit
More examples:
- あいつの魂胆は一体何なんだ? ⇨ What the hell is his true motive, scheme?
 - こんな遅くに訪ねて来るとは一体どういう料簡してるんだ? ⇨ What kind of common sense does he have to visit someone this late?
 - あいつは一体何者だ? ⇨ Who the hell is he?
 - 一体いつ答えが出るんだ? ⇨ When the heck are we going to get an answer?
 - お前一体何やってんだ? ⇨ What the hell are you doing?
 - 一体何のつもりだ? ⇨ What are you trying to do?
 - 一体全体どうなっているんだ? ⇨ What in the world is going on?
 - 一体何事? ⇨ What’s going on? What’s the big problem?
 - 一体あいつはどういう感覚をしているのか ⇨ What kind of sensibility does that guy have? He’s clueless
 - バイクは車より一体感が感じられて良い ⇨ I prefer a bike over a car because I feel like one more
 - こいつら一体何なんだ? ⇨ Who the hell are these people?
 - あいつ一体何を唐突に言い出したんだ? ⇨ What in the world is he talking about all of sudden?
 - 成功と失敗は表裏一体だ ⇨ Success and failure is two sides of a coin
 - 一体何なんだ? ⇨ What the hell is the deal? What the hell is going on?
 - 彼は一体どういう人物なんだ? ⇨ What kind of person is he? What are his personal backgrounds, histories, achievements, etc. ?