げんこつじゃありませんでした
拳骨じゃありませんでした
genkotsujārimasendeshita

Noun
Desu Copula

The polite, past negative form of げんこつ

1. Was not a fist.; Was not made of fist-bone.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana