よん文字 もじ言葉 ことばじゃなかったです
yommojikotobajanakattadesu

Noun
Desu Copula

The polite, past negative form of 四文字言葉

1. It wasn't a four-character idiom.; It wasn't a four-character word.

Past/Perfective
Negative
Polite
Casual Register