だいこくむくどりぎじゃありませんでした
大黒椋鳥擬じゃありませんでした
daikokumukudorigijārimasendeshita

Noun
Desu Copula

The polite, past negative form of おおくろむくどりもどき

1. Was not a great blackbird mimic.; Was not pretending to be a great blackbird.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana