fantastical

/fænˈtæstɪkəl/
adjective
  1. Extremely imaginative, strange, or unrealistic; like something from a fantasy.
    • The artist painted a fantastical landscape filled with floating islands and glowing creatures.
    • She told a fantastical story about a dragon who guarded a library of talking books.
    • The movie's special effects created a fantastical world that amazed audiences of all ages.
  2. Very unusual or surprising in a way that is hard to believe.
    • The explorer gave a fantastical account of his journey, claiming he had found a city of gold.
    • It sounds fantastical, but the tiny seed grew into a tree that produced both apples and oranges.
    • The scientist's theory seemed fantastical at first, but later experiments proved it was correct.