きっと
definitely, certainly, for sure
adverb
彼はきっと仕事で忙しいから、返事が遅いんだろう。
He's probably busy with work, so that's why his reply is late.
この映画はきっと面白いと思う。友達が絶賛していたから。
This movie is sure to be interesting. My friend praised it highly.
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