The phrase "not to be quoted" is commonly used to indicate that the statement being made should not be repeated or attributed to the original speaker. There are many synonyms that can be used in place of this phrase, depending on the context. Some of these synonyms include "off the record," "strictly confidential," "for your ears only," "unofficial," "confidentially," "in strictest confidence," and "non-attributable." These phrases convey the same message and serve the same purpose, which is to ensure that the information shared remains private and is not used against the speaker in the future. It is important to use these phrases appropriately and respectfully to maintain trust and credibility in communication.