もんかくつうでわありませんでした
紋殻通ではありませんでした
monka kutsūdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of もんがらどおし

1. Was not familiar with patterns/designs.; Was not knowledgeable about designs.

Past/Perfective
Negative
Polite
Formal Register
Usually Written in Kana