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

1350–1400; Middle English fantastik pertaining to the imaginative faculty < Medieval Latin fantasticus, variant of Late Latin phantasticus < Greek phantastikós able to present or show (to the mind), equivalent to *phantad-, base of phantázein to make visible (akin to phānós light, bright, phaínein to make appear) + -tikos -tic

fantastically, adverb
fantasticalness, fantasticality, noun
superfantastic, adjective
superfantastically, adverb
unfantastic, adjective
unfantastically, adverb

1. Fantastic, bizarre, grotesque, weird share a sense of deviation from what is normal or expected. Fantastic suggests a wild lack of restraint, a fancifulness so extreme as to lose touch with reality: a fantastic scheme for a series of space cities. In informal use, fantastic often means simply “exceptionally good”: a fantastic meal. Bizarre means markedly unusual or extraordinarily strange, sometimes whimsically so: bizarre costumes for Mardi Gras; bizarre behavior. Grotesque implies shocking distortion or incongruity, sometimes ludicrous, more often pitiful or tragic: a grotesque mixture of human and animal features; grotesque contrast between the forced smile and sad eyes: a gnarled tree suggesting the figure of a grotesque human being. Weird refers to that which is mysterious and apparently outside natural law, hence supernatural or uncanny: the weird adventures of a group lost in the jungle; a weird and ghostly apparition. Informally, weird means “very strange”: weird and wacky costumes; weird sense of humor. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fantastic (fænˈtæstɪk)
1.  strange, weird, or fanciful in appearance, conception, etc
2.  created in the mind; illusory
3.  extravagantly fanciful; unrealistic: fantastic plans
4.  incredible or preposterous; absurd: a fantastic verdict
5.  informal very large or extreme; great: a fantastic fortune; he suffered fantastic pain
6.  informal very good; excellent
7.  of, given to, or characterized by fantasy
8.  not constant; capricious; fitful: given to fantastic moods
9.  archaic a person who dresses or behaves eccentrically
[C14 fantastik imaginary, via Late Latin from Greek phantastikos capable of imagining, from phantazein to make visible]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., "existing only in imagination," from O.Fr. fantastique, from L.L. phantasticus "imaginary," from Gk. phantastikos "able to imagine," from phantazein "make visible" (middle voice phantazesthai "picture to oneself"); see fantasy. Trivial sense of "wonderful, marvelous" first recorded 1938.

late 15c., from fantastic + -al (1). Related: Fantastically.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
From drawings to computer animation, the magic of cartoon movies allows audiences to explore a fantastical and imaginary world.
And one can only imagine what he will do with the fantastical images that now
  people his brain.
Some of my friends started spinning fantastical explanations, including my
  political views and simple jealousy.
So basically the concern about living in a bubble seems to me to be utterly
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