Blissed-out is a term that is often used to describe a euphoric or tranquil state of mind. However, there are many other synonyms that can be used to describe this feeling depending on the context. Some alternatives to blissed-out might include "content," "happy-go-lucky," "ecstatic," "blissful," "serene," "tranquil," "relaxed," "peaceful," "joyful," "euphoric," or "elated." Each of these synonyms is unique and can help to convey a slightly different nuance to the feeling of being blissed-out. By choosing the right synonym, you can paint a more accurate picture of the state of mind you are trying to describe.