むしろじゃありませんでした
筵じゃありませんでした
mushirojārimasendeshita

Noun
Desu Copula

The polite, past negative form of むしろ

1. It was not a platform.; It was not a banquet.; It was not a seat.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana