ゆるがせでわありませんでした
忽せではありませんでした
yurugasedewārimasendeshita

Desu Copula
na-Adjective

The polite, past negative form of ゆるがせ

1. Was not ignored.; Was not overlooked.

Past/Perfective
Negative
Polite
Formal Register
Usually Written in Kana