がっかり
がっかり · gakkari · JLPT N3 · noun
be dejected
Sounds like got a curry? — no curry left, so you are let down
がっかり is a Japanese mimetic word for the moment hope drops away. The small っ makes a short stop, like a breath caught before a sigh. Use it as a verb with する: 結果にがっかりした means I was disappointed by the result.