たいそうじゃありませんでした
大層じゃありませんでした
taisōjārimasendeshita

Desu Copula
na-Adjective

The polite, past negative form of たいそう

1. It wasn't a big deal.; It wasn't excessive.; It wasn't a fuss.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana