ぎんとんぼじゃなかったです
銀蜻蜓じゃなかったです
gintombojanakattadesu

Noun
Desu Copula

The polite, past negative form of ぎんやんま

1. It wasn't a silver dragonfly.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana