てっきり...と思う
surely; certainly; without a doubt
JLPT
N3
構造
てっきり + V・A・Naだ・N だ + とおもう
意味
Used to explain a situation that one thought was true based on some basis or clue. 「てっきり」emphasizes a high level of certainty, but in reality, most of the time it's not true. It can only be used for reasoning in the past.
助
けを
求
める
叫
び
声
が
聞
こえたので
、
てっきり
強盗
だと
思
って
警察
に
知
らせたんです
。
I heard cries for help, so I called the police, thinking it was definitely a robbery.
足跡
があったので
、
てっきり
猫
だと
思
ったんです
。
There were footprints, so I thought it was a cat.
てっきり
反対
されると
思
っていたが
、
逆
に
賛成
されたので
、
びっくりした
。
I thought there would be a lot of opposition, but I was surprised when I was met with support.
