moral fibre

UK uncountable usually

(UK) The inner strength to do what one believes to be right; often an ability to make difficult decisions.

Japanese Meaning

正しいと信じる行動をとるための内面的な強さや精神的な堅さ / 困難な状況においても正しいと考える決断を下す力や判断力

Her moral fibre was tested when she chose to report the fraud despite overwhelming pressure to stay silent.

沈黙を守るよう強い圧力がかかる中で、不正を告発することを選んだとき、彼女の道徳的な強さが試された。

Sense（1）

(UK) The inner strength to do what one believes to be right; often an ability to make difficult decisions.

He lacked the moral fibre to be a leader.

moral fibres

（ plural ）