miscalculation; disappointment
Refers to a situation where one's expectations or predictions turn out to be wrong, leading to disappointment or an unexpected outcome. Often used when plans go awry due to a misreading of circumstances.
His reaction was a miscalculation on my part.
株価が上がると思ったが、思惑違いに終わった。
I thought stock prices would rise, but it ended in disappointment.