The phrase "be deaf to" means to ignore or disregard something that is being said or suggested. There are several synonyms that can be used to express this same idea, such as "turn a blind eye," "tune out," "brush off," "disregard," "discount," or "overlook." These synonyms can be used interchangeably to convey the message that someone is choosing to not pay attention to whatever is being communicated to them. Being deaf to someone's words or actions can be frustrating, especially when you are trying to communicate effectively. However, using these synonyms can help to convey this situation in a more relatable and understandable way.