無駄骨 むだぼね りではありませんでした
mudaboneoridewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 無駄骨折り

1. It was not in vain.; It wasn't fruitless.; It wasn't a waste of effort.

Past/Perfective
Negative
Polite
Formal Register