"Pry into" is an idiomatic phrase that means to intrude into someone's privacy or affairs without their permission. There are several synonyms to this phrase that can be used interchangeably depending on the context of the situation. These synonyms include snoop, investigate, delve, probe, quiz, question, inquire, scrutinize, and spy. Each of these words implies a level of curiosity, inspection or scrutiny, but may have slightly different meanings depending on the specific situation. It is important to choose the perfect synonym that best matches the context and tone of the sentence in which it is used, to ensure clarity and proper communication.