てっきり

〔間違いなく， 疑いなく， きっと， 確かに〕

¶彼は君が～到着したものだと思い込んでいた

He reckoned that you already arrived there.

surely
certainly
beyond doubt

* * *

てっきり

〔間違いなく， 疑いなく， きっと， 確かに〕

¶彼は君が～到着したものだと思い込んでいた

He reckoned that you already arrived there.

* * *

てっきり

●てっきり…だと思う take (it) for granted that…; be convinced that….

●てっきり彼女は来るとばっかり思っていた. I was totally convinced that she would come. | I never for a moment dreamed that she wouldn't come.

・てっきり彼が犯人だと思った. I just assumed all along [felt dead sure] that he was the man who committed the crime.

・てっきり今日は店が開いていると思い込んでいた. I was absolutely certain the shop would be open today.