悪戯 いたずら坊主 ぼうずではありませんでした
itazurabōzudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 悪戯坊主

1. Was not a mischievous child.; Was not a prankster.

Past/Perfective
Negative
Polite
Formal Register