The phrase "not identified" can be replaced with several synonyms which convey the same meaning. Alternatives like "unrecognized," "anonymous," "unknown," "unnamed," "unfamiliar," and "unacknowledged" can be used to imply that a person, place or thing is unidentified. These terms can be applied in various contexts, such as an unobserved object or an anonymous caller. The words "non-identifiable," "undetermined," and "untraceable" might also be useful alternate expressions when referencing an item that is not able to be easily found or discovered. In other words, there are plenty of options available that can help to achieve an accurate description of something that has yet to be recognized.