てっきり (tekkiri)

てっきりもう帰かえったと思おもってましたよ

I thought that he had already gone home.

てっきりそうに違いないと思った.

I thought it must be so.

てっきり,これでおれも最後だと思った.

I thought my time had come for sure.

私はそれがてっきりこれで最後かと思った。

I thought for sure that this would be the end.

てっきり彼女なら合格すると思っていました.

We were convinced [We took it for granted] that she would pass the test.

てっきり木村君の仕業だとばかり思いこんでいた.

I took it for granted that it was Kimura's work (and nobody else's).

てっきり僕ぼくたちはどこかに行いくものだと思おもっていたよ。

I thought we were going to go somewhere.

てっきりあなたが我々われわれといっしょに来こられるものと思おもっていました。

I took it for granted that you would come with us.

てっきり君は27日に予定があるとおもっていたよ。ごめん、私の勘違いだった。

I thought you had plans for the 27th. I'm sorry I misunderstood.