もんかくつうじゃありませんでした
紋殻通じゃありませんでした
monkakutsūjārimasendeshita

Noun
Desu Copula

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

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

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana