1) Chimeral 2) Chimeric 3) Illusionary 4) Unrealistic 1) Chimeral 2) Chimeric 3) Imaginary 4) Mythical creature 5) Mythical monster 6) Unreal 7) Wildly fanciful 
imaginary; fanciful
• (a.) Merely imaginary; fanciful; fantastic; wildly or vainly conceived; having, or capable of having, no existence except in thought; as, chimerical projects.
Chi·mer'ic·al adjective Merely imaginary; fanciful; fantastic; wildly or vainly conceived; having, or capable of having, no existence except in thought; as, chimerical projects. Syn. -- Imaginary; fanciful; fantastic; wild; unfounded; vain; deceitful; delusive.
[adj] - produced by a wildly fanciful imagination
adjective produced by a wildly fanciful imagination; `his Utopia is not a chimerical commonwealth but a practical improvement on what already exists`- Douglas Bush
unreal; imaginary; visionary: a chimerical terrestrial paradise. · wildly fanciful; highly unrealistic: a chimerical plan.
[SAT terms] produced by a wildly fanciful imagination