こう性能 せいのう爆薬 ばくやくじゃなかったです
kōseinō baku yakujanakattadesu

Noun
Desu Copula

The polite, past negative form of 高性能爆薬

1. Wasn't high-performance explosives.; Wasn't a high-performance explosive.

Past/Perfective
Negative
Polite
Casual Register