べんけいそうでわありませんでした
弁慶草ではありませんでした
benkeisōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of べんけいそう

1. Was not Bengara grass.; Was not a rough, strong person.

Past/Perfective
Negative
Polite
Formal Register
Usually Written in Kana