degradation

The degradation of his character was shocking.

彼の人格の堕落は衝撃的だった。

The degradation of the environment is a major concern.

環境の悪化は大きな懸念事項だ。

The degradation of the plastic took many years.

プラスチックの分解には多くの年数がかかった。

The degradation of his position was a result of poor performance.

彼の地位の降格は業績不振の結果だった。