The kanji 悔 primarily conveys the feeling of regret, remorse, or repentance. It signifies a deep sense of sorrow or disappointment over something that has happened or something one has done (or failed to do). It implies a recognition of a mistake and a wish that things could have been different. It often involves a sense of self-blame or a yearning to undo the past.

・On-yomi (音読み): ・カイ (kai) ・Kun-yomi (訓読み): ・く悔いる (kuiiru) - to regret, to repent ・く悔やむ (kuyamu) - to be sorry, to mourn

⚫︎後悔 (kōkai) Translation: Regret; remorse ⚫︎悔しい (kuyashii) Translation: Regretful; vexing; frustrating ⚫︎悔い改める (kuikayameru) Translation: To repent; to reform

The kanji 悔 is a phono-semantic compound (形声文字, keisei moji). The left side is the "radical" (部首, bushu), which is the heart radical (忄 or りっしんべん, riっshinnben), representing emotion or the mind. The right side is 每 (mai), which functions as the phonetic component, indicating the sound of the kanji. The combination suggests that the feeling of 悔 arises from the emotions or the mind (represented by the heart radical) and is linked to the sound or pronunciation related to 每.