lěngdàn de dǎzhāohū

say hello coldly

The phrase '冷淡地打招呼' is used in Chinese to describe the act of greeting someone in a way that seems unfeeling or distant. This could happen in situations where one does not feel emotionally connected to the other person or is simply being polite without any warmth. It's often used to convey a lack of interest or friendliness in the interaction.