やまなりじゃありませんでした
山鳴じゃありませんでした
yamanarijārimasendeshita

Noun
Desu Copula

The polite, past negative form of やまならし

1. It wasn't a mountain roaring.; It wasn't as if a mountain was roaring.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana