Unsearchably is an uncommon word used to describe something that is impossible to search or investigate. There are a few synonyms for this word, such as inscrutable, unfathomable, impenetrable, and inexplicable. These words convey similar meanings and can be used interchangeably depending on the context. For example, a deep and complex philosophical concept may be described as an inscrutable idea that is difficult to comprehend. Similarly, a hidden secret or a mysterious phenomenon can be referred to as an impenetrable mystery that no one can solve. Overall, these synonyms can be used to describe anything that is hard to understand or investigate.