あっけない
N1呆気ない呆気無い
[akkenai]
Meanings
1.Adj-i
unsatisfying; disappointing; abrupt; not enough; too quick; too short; over too soon
Examples
チャンピオンがあっけなく初戦で敗退した。
The champion was eliminated in the first round with surprising ease.
十年ぶりの再会はあっけなかった。
The reunion after ten years was disappointingly brief.
今回の試合はあっけなくないと思う。
I think this match is not going to end too quickly.