In seventh heaven is an idiomatic expression used to describe a state of euphoria or extreme happiness. While it is a commonly used phrase, there are many synonyms that can be used in its place. Words like blissful, ecstatic, overjoyed, elated, and thrilled are a few great examples. Other words that can be used include exhilarated, exultant, jubilant, and rapturous. These words all convey the same sense of extreme happiness as being in seventh heaven. Using synonyms can help to add variety and freshness to your language and make your writing or speech more interesting and engaging.