なぎじゃありませんでした
梛じゃありませんでした
nagijārimasendeshita

Noun
Desu Copula

The polite, past negative form of なぎ

1. Was not (a type of oak tree); Was not (humble/polite past negative)

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana