Kanji 恨 regret, bear a grudge, resentment 極 extreme, pole, extremely Related words 痛つう 恨こん 痛恨 is a noun meaning 'deep regret' or 'bitter remorse'; 痛恨の極み is a set phrase that intensifies it to 'the height of regret'.
残ざん 念ねん 残念 is a common, everyday word for 'regrettable' or 'disappointing'; 痛恨の極み is much stronger and more formal, used for profound personal or professional regret.
Written forms 痛つう 恨こん の 極きわ み
Standard kanji spelling for this fixed expression.
痛つう 恨こん のきわみ
Mixed kanji-kana spelling; 極み is sometimes written in kana for readability.
Etymology Compound of 痛恨 (deep regret) + の (possessive particle) + 極み (extreme, height). The phrase follows a classical pattern for expressing the utmost degree of a feeling.
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