1. conceived or appearing as if conceived by an unrestrained imagination; odd and remarkable; bizarre; grotesque: fantastic rock formations; fantastic designs.
  2. fanciful or capricious, as persons or their ideas or actions: We never know what that fantastic creature will say next.
  3. imaginary or groundless in not being based on reality; foolish or irrational: fantastic fears.
  4. extravagantly fanciful; marvelous.
  5. incredibly great or extreme; exorbitant: to spend fantastic sums of money.
  6. highly unrealistic or impractical; outlandish: a fantastic scheme to make a million dollars betting on horse races.
  7. Informal. extraordinarily good: a fantastic musical.

adjective Also: fantastical

  1. strange, weird, or fanciful in appearance, conception, etc
  2. created in the mind; illusory
  3. extravagantly fanciful; unrealisticfantastic plans
  4. incredible or preposterous; absurda fantastic verdict
  5. informal very large or extreme; greata fantastic fortune; he suffered fantastic pain
  6. informal very good; excellent
  7. of, given to, or characterized by fantasy
  8. not constant; capricious; fitfulgiven to fantastic moods


  1. archaic a person who dresses or behaves eccentrically

late 15c., from fantastic + -al (1). Related: Fantastically.


late 14c., “existing only in imagination,” from Middle French fantastique (14c.), from Medieval Latin fantasticus, from Late Latin phantasticus “imaginary,” from Greek phantastikos “able to imagine,” from phantazein “make visible” (middle voice phantazesthai “picture to oneself”); see phantasm. Trivial sense of “wonderful, marvelous” recorded by 1938.

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