退屈 たいくつしのぎではありませんでした
taikutsushinogidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 退屈しのぎ

1. It was not just to pass the time.; It wasn't simply a way to alleviate boredom.

Past/Perfective
Negative
Polite
Formal Register