おすましじゃなかったです
お澄ましじゃなかったです
osumashija nakattadesu

Noun
Desu Copula

The polite, past negative form of おすまし

1. Wasn't being refined/prim.; Wasn't acting dignified.; Wasn't putting on airs.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana