あっけじゃなかったです
呆気じゃなかったです
akkejanakattadesu

Noun
Desu Copula

The polite, past negative form of あっけ

1. Wasn't clumsy.; Wasn't awkward.; Wasn't slow-witted.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana