警戒 けいかい水準 すいじゅんじゃなかったです
keikaisuijunjanakattadesu

Noun
Desu Copula

The polite, past negative form of 警戒水準

1. Wasn't on alert.; Wasn't vigilant.; Wasn't cautious.

Past/Perfective
Negative
Polite
Casual Register