あっけ
being taken aback; state of shock; dumbfoundedness
Common word Also written あっ気
Noun
私わたしは呆気あっけにとられた。
When I heard it, I was dumbfounded.
呆気あっけに取とられて物ものも言いえずに、その男おとこを見みつめた。
She stared at the man in silent astonishment.