No. 2,879 in Japanese
てっきり
Certainly (used when mistakenly assuming something).
In a sentence
てっきり彼が来ると思っていましたが、来ませんでした。
I was certain he would come, but he didn't.
The word 'てっきり' is used to express strong expectation or certainty about something, which turned out to be incorrect.
彼がてっきり知っていると思っていましたが、知らなかったんですね。
I assumed he surely knew, but he didn't.
'てっきり' is employed here to denote a strong belief or assumption that turned out to be false.
そのイベントはてっきり無料だと思い込んでいましたが、実際には参加費が必要でした。
I mistakenly thought the event was free, but it actually required a participation fee.
In this sentence, 'てっきり' highlights an incorrect assumption or expectation that was confidently held.
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