(a.) Merely imaginary; fanciful; impossible; wildly or vainly conceived; as, chimerical projects\.

Barmecidal Barmecide absurd aerial air-built airy ambitious apparent apparitional autistic chimeric cloud-born cloud-built cloud-woven deceptive delusional delusionary delusive delusory dereistic dreamlike dreamy erroneous ethereal fabulous fallacious FALSE fanciful fantastic fatuitous fatuous fictional fictive gaseous gossamery illusional illusionary illusive illusory imaginary misleading mythical ostensible phantasmagoric phantasmal phantom phantomlike preposterous pretentious rarefied seeming self-deceptive self-deluding shadowy specious spectral spirituous subtile subtle supposititious tenuous unactual unfounded unreal unsubstantial utopian vaporous vapory visionary windy