ついでじゃありませんでした
序でじゃありませんでした
tsuidejārimasendeshita

Noun
Desu Copula

The polite, past negative form of ついで

1. It wasn't by chance.; It wasn't on purpose.; It wasn't as far as that.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana