phantastic

Adjective

fantastic (comparative more fantastic, superlative most fantastic)

1. Wonderful; marvelous; excellent; extraordinarily good or great (used especially as an intensifier).
   • "I had a simply fantastic vacation, and I can't wait to tell you all about it!"

   Synonyms:

   brilliant, fabulous, splendid, super, wonderful, ace, admirable, amazing, awe-inspiring, awesome

2. Existing in or constructed from fantasy; of or relating to fantasy; fanciful.
   • He told fantastic stories of dragons and goblins.

   Synonyms:

   fantastical, fabulous

3. (archaic) Given to fanciful ideas, impulsive; irrational.
   • She was a frightened fool, and she was fantastic, and I suppose that, at that time, she really cared for that imbecile.1915, Ford Madox Hueffer [i.e., Ford Madox Ford], The Good Soldier […], London: John Lane, The Bodley Head; New York, N.Y.: John Lane Company, →OCLC
4. (archaic) Not believable; implausible; seemingly only possible in fantasy.
   • And indeed, when in the writings of Paracelſus I meet with ſuch Phantaſtick and Un-intelligible Diſcourſes as that Writer often puzzels and tyres his Reader with, father'd upon ſuch excellent Experiments, as though he ſeldom clearly teaches, I often find he knew ; me thinks the Chymiſts, in their...1661, Robert Boyle, “THE CONCLUSION”, in The Sceptical Chymist: or Chymico-Physical Doubts & Paradoxes, Touching the Spagyrist's Principles Commonly call'd Hypostatical, As they are wont to be...

   Synonyms:

   fantastical, unrealistic, wild

5. (archaic) Resembling fantasies in irregularity, caprice, or eccentricity; irregular; grotesque.
   • There at the foot of yonder nodding beech, / That wreathes its old fantastic roots so high.1750 June 12 (date written; published 1751), T[homas] Gray, “Elegy Written in a Country Churchyard”, in Designs by Mr. R[ichard] Bentley, for Six Poems by Mr. T. Gray, London: […] R[obert] Dodsley...

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