ひょうしぬけ
anticlimax; let-down; disappointment; loss of interest
Also written 拍子ぬけ、拍子抜
Noun, Suru verb, Intransitive, No-adjective
君きみが来れないと聞きいたときは、拍子抜ひょうしぬけしてしまったよ。
I was disappointed when I heard that you couldn't come.