- 不知好歹 bùzhīhǎodǎi to not know what is best for oneselfunable to differentiate good from bad; failing to recognize or appreciate someone's good intentions
- 不识好歹 bùshíhǎodǎi to not know what's best for oneunable to tell good from bad; undiscriminating or ungrateful. Used to describe someone who cannot distinguish right from wrong, or who fails to appreciate someone's good intentions or the seriousness of a situation.
- 不问好歹 bùwènhǎodǎi indiscriminatelyIndiscriminately; regardless of the situation, consequences, or who is right or wrong