Fancifulnesses is a tricky word to come up with synonyms for. It describes the quality of being imaginative, creative, or whimsical - all of which are synonyms for fancifulnesses themselves. However, there are a few other words that could be used to describe this quality. For example, someone who is fanciful might be called dreamy, idealistic, or optimistic. They may also be described as having a vivid imagination, being unconventional, or having a fantastical outlook on life. No matter what word you use to describe fancifulnesses, it is a quality that is highly valued in creative fields like literature, art, and design.