つけっぱなしじゃなかったです
付けっぱなしじゃなかったです
tsukeppanashijanakattadesu

Noun
Desu Copula

The polite, past negative form of つけっぱなし

1. Wasn't left on.; Wasn't still attached.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana