ごきぶりじゃなかったです
蜚蠊じゃなかったです
gokiburijanakattadesu

Noun
Desu Copula

The polite, past negative form of ごきぶり

1. Wasn't a cockroach.; Was not a cockroach.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana