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.
Online Etymology Dictionary, © 2010 Douglas Harper
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