かげろうじゃありませんでした
蜻蛉じゃありませんでした
kagerōjārimasendeshita

Noun
Desu Copula

The polite, past negative form of とんぼ

1. Was not a dragonfly.; Was not a darner.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana