chimerical

adjective5

1. •
   Being a figment of the imagination; fantastic (in the archaic sense).

   • With his head bent, and his big feet spread apart, he began explaining his reasons for thinking the abbé’s plan chimerical. — 1869
2. •
   Inherently fantastic; wildly fanciful.
3. •
   Of or pertaining to a chimera.
4. •
   Resulting from the expression of two or more genes that originally coded for separate proteins.
5. •
   Impossible to physically produce due to having an impossibly-high saturation or luminosity, but viewable by overlaying an afterimage and a suitably-colored physical image.