あたまじゃなかったです
頭じゃなかったです
atamajanakattadesu

Noun
Desu Copula

The polite, past negative form of かぶし

1. It wasn't on my mind.; I didn't think of it.; I didn't consider it.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana