The phrase "is vested" means that someone has a legal right to something, typically a retirement fund or employee benefit. Some synonyms for "is vested" include "is entitled," "has possession," "owns," and "has earned." If someone is vested in a particular outcome, it can also mean that they are emotionally invested in it. Other synonyms for this use of the term can include "committed," "dedicated," "attached," or "passionate." Ultimately, the connotation of "is vested" depends on the context in which it is used, but these synonyms can help provide a broader understanding of its meaning.