miscalculation
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時間がかかりすぎたのは大きな誤算だった。
It was a major miscalculation that it took too much time.
参加者が予想より少なかったのは誤算だ。
It was a miscalculation that there were fewer participants than expected.
彼に断られるとはまったくの誤算だった。
It was a complete miscalculation that he would turn me down.