There are several synonyms for the phrase "leave unprotected." Some of the most common ones include "neglect," "abandon," "expose," "jeopardize," and "endanger." Each of these words carries a slightly different connotation, but all suggest some form of disregard for safety, security, or well-being. For example, "abandon" implies a deliberate decision to leave behind, whereas "neglect" suggests a failure to provide adequate care or attention. Similarly, "expose" and "jeopardize" both suggest a potential danger or harm, but "expose" may imply a more passive or accidental act, while "jeopardize" implies more intentional or reckless behavior. Ultimately, the choice of synonym will depend on the specific context and intended meaning.