悔 fui³ {huǐ}

to regret

悔婚 fui³ fan¹ {huǐ hūn}

to break a promise of marriage

悔改 fui³ goi² {huǐ gǎi}

1. to repent
2. repentance

悔過〔-过〕 fui³ gwo³ {huǐ guò}

1. to regret
2. to repent

悔恨 fui³ han⁶ {huǐ hèn}

1. remorse
2. repentance

悔意 fui³ ji³ {huǐ yì}

remorse

悔棋 fui³ kei² {huǐ qí}

to withdraw a move (chess)

悔悟 fui³ ng⁶ {huǐ wù}

to repent

悔罪 fui³ zeoi⁶ {huǐ zuì}

conviction

悔過書〔-过书〕 fui³ gwo³ syu¹ {huǐ guò shū}

written repentance

悔之莫及 fui³ zi¹ mok⁶ kap⁶ {huǐ zhī mò jí}

Repentance comes too late

悔不當初〔--当-〕 fui³ bat¹ dong¹ co¹ {huǐ bù dāng chū}

to regret one's past deeds (idiom)

悔過自新〔-过--〕 fui³ gwo³ zi⁶ san¹ {huǐ guò zì xīn}

to repent and start afresh (idiom); to turn over a new leaf

悔恨交加 fui³ han⁶ gaau¹ gaa¹ {huǐ hèn jiāo jiā}

to feel remorse and shame (idiom)

悔之已晚 fui³ zi¹ ji⁵ maan⁵ {huǐ zhī yǐ wǎn}

too late to be sorry

悔之無及〔--无-〕 fui³ zi¹ mou⁴ kap⁶ {huǐ zhī wú jí}

too late for regrets (idiom); It is useless to repent after the event.