れっこじゃなかったです
narekkojanakattadesu

Noun
Desu Copula
na-Adjective
no-Adjective

The polite, past negative form of 慣れっこ

1. Wasn't used to it.; Wasn't accustomed to it.; Wasn't familiar with it.

Past/Perfective
Negative
Polite
Casual Register