てっきり

「てっきりあなたが買うのかと思った」と私は答えた。

I replied, “I was sure you were going to buy it.”

てっきりずっと日本にいるかと思ったよ。

I was sure you’d be in Japan the whole time.

てっきり管理者かと

I thought you were the admin.

— ブゴニア (2025)

てっきり死んだと思ったじゃねえか

You had me convinced you were dead!

— レザボア・ドッグス (1992)

てっきりそういうのが流行ってるのかと思った

I just assumed that sort of thing was trendy.

— The Garden of Sinners: Paradox Spiral (2008)

俺はてっきり…

I was sure that…

— AKIRA (1988)

てっきり泥棒かと思って誰だ？

I thought you were a thief. Who are you?

— オープン・ユア・アイズ (1997)

おれはてっきり君がその男かと思ったが―違うようだ

I was sure you were that man—but I guess I was wrong.

— 海の上のピアニスト (1998)

てっきり僕たちはどこかに行くものだと思っていたよ。

I was sure we were going somewhere.

てっきり水浸しになったか、吹き飛ばされたと思っていたのに。

I was sure it had been flooded or blown away.