Fool-paradise is a phrase that is used to describe a person's unrealistic or foolish expectations. It can be challenging to find an appropriate synonym for this phrase, but some alternatives include fool's paradise, pipe dream, false hope, delusion, illusion, mirage, and fantasy. Fool's paradise is quite similar in meaning to fool-paradise, as it refers to a situation where someone is living in a state of delusion or unreasonable optimism. Pipe dream is another option that is commonly used to describe unrealistic desires or expectations that are unlikely to come true. Ultimately, the synonym chosen for fool-paradise will depend on the context in which it is used and the tone of the writing.