This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Created by or as if by a wildly fanciful imagination; highly improbable.

adj. Given to unrealistic fantasies; fanciful.

adj. Of, related to, or being a chimera.

adj. Of or pertaining to a chimera.

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

adj. Inherently fantastic; wildly fanciful.

adj. Merely imaginary; fanciful; fantastic; wildly or vainly conceived; having, or capable of having, no existence except in thought.

Pertaining to or of the nature of a chimera; wholly imaginary; unreal; fantastic.

Incapable of realization; fantastically imaginative; preposterous: as, chimerical ideas, notions, projects, or fancies.

Given to or entertaining chimeras or fantastic ideas or projects: as, a chimerical enthusiast; the work of a chimerical brain.

adj. being or relating to or like a chimera

adj. produced by a wildly fanciful imagination

"He interested his brother Etienne in these so-called chimerical projects."

unrealistic   

chimerically   

wild    delusive    deceitful    vain    imaginary    unfounded    fanciful    fantastic    visionary   

clerical    numerical   

baseless    impracticable    illusory    fallacious    visionary    impractical    untrue    unrealistic    fanciful    unwarranted