This is the 3892nd most frequent Japanese word.
ガッカリ
"ガッカリ" means "disappointed" or "let down."
ガッカリ is used here to express personal disappointment at an undesirable event.
試験の結果が悪くてガッカリしました。
I was disappointed because the result of the test was bad.
ガッカリ is used in this sentence to describe recurrent disappointment caused by someone's actions.
彼の遅刻にはいつもガッカリさせられる。
His lateness always makes me disappointed.
ガッカリ is employed collectively to express a shared sentiment of disappointment.