おはぐろかげろうじゃありませんでした
御歯黒蜻蛉じゃありませんでした
ohagurokagerōjārimasendeshita

Noun
Desu Copula

The polite, past negative form of おはぐろとんぼ

1. Was not a dragonfly.; Was not skilled/experienced.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana