Imaginarily is a word that describes something that exists only in the imagination. Synonyms for this word include fictitiously, fancifully, and unrealistically. Fictitiously refers to something that is invented or imaginary, while fancifully implies something that is based on imagination or whimsy. Unrealistically denotes something that is not grounded in reality. Other synonyms for imaginarily include imaginatively, dreamlike, and ethereal. These words can be used interchangeably depending on the context of the sentence. When writing creatively, it is essential to use the appropriate synonym for imaginarily to accurately convey the intended meaning.