ゆるがせじゃありませんでした
忽せじゃありませんでした
yurugasejārimasendeshita

Desu Copula
na-Adjective

The polite, past negative form of ゆるがせ

1. It was not ignored.; It wasn't overlooked.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana