ごきぶりじゃありませんでした
蜚蠊じゃありませんでした
gokiburijārimasendeshita

Noun
Desu Copula

The polite, past negative form of ごきぶり

1. Was not a cockroach.; Was not a bug.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana