可逆 かぎゃく圧縮 あっしゅくではありませんでした
fuka gyakuasshukudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 不可逆圧縮

1. Was not lossless compression.; Was not irreversible compression.

Past/Perfective
Negative
Polite
Formal Register
Computing