chimerical

Adjective

chimerical (comparative more chimerical, superlative most chimerical)

1. Of or pertaining to a chimera.
2. Being a figment of the imagination; fantastic (in the archaic sense).
   • a chimerical goal
   • "Yes; I have a turn both for observation and for deduction. The theories which I have expressed there, and which appear to you to be so chimerical, are really extremely practical—so practical that I depend upon them for my bread and cheese."1887, Arthur Conan Doyle, A Study in Scarlet
3. Inherently fantastic; wildly fanciful.
   • "You are the most charming person in the world. You are invested with a perfect halo of delight," exclaimed Henrietta. "Miss Churchill has some chimerical notion of honour in her head, but that is over now; your information does not leave a single obstacle in the way of the most perfect happiness...1837, L[etitia] E[lizabeth] L[andon], chapter VII, in Ethel Churchill: Or, The Two Brides. […], volume III, London: Henry Colburn, […], →OCLC, page 51
4. Resulting from the expression of two or more genes that originally coded for separate proteins.
5. (vision) 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.