一体 いったい全体 ぜんたい
ittaizentai

Adverb

1. ... the heck (e.g. "what the heck?"); ... in the world (e.g. "why in the world?"); ... on earth (e.g. "who on earth?")

一体 いったい全体 ぜんたい何故 なぜ きみがここにいるのだ?
ittaizentai naze kimiga kokoni iru noda
Why on earth are you here?
Other forms: