悔しく思う程度 the degree to which one feels vexed
- EDR日英対訳辞書
玉鬘は大君の不幸や自分の息子たちの出世の遅さと比べるにつけ、思うに任せぬ世を悔しく思い後悔の念は耐えない。 Every time when Tamakazura thought of unhappiness of Oigimi and compared Kaoru and Kurodo no Shosho with her sons whose promotions were slow, she was bitterly disappointed by this frustrating world and could not help feeling regret.
- Wikipedia日英京都関連文書対訳コーパス