Of the nature of a phantom or fantasy; produced or existing only in imagination; imaginary; not real.Due to fantasy or whim; arising from or caused by caprice; groundless; illusive.Morbidly or grotesquely fanciful; manifesting a disordered imagination; chimerical.Suggestive of fantasies through oddness of figure, action, or appearance, or through an air of unreality; whimsically formed or shaped; grotesque.Controlled by fantasy; indulging the vagaries of imagination; capricious: as, fantastic minds; a fantastic mistress.Synonyms Grotesque, etc. (see fanciful); odd, qneer, strange, freakish, quaint.n. One who acts fantastically or ridiculously; a grotesque. Sometimes used in the plural of a company of persons grotesquely dressed, and acting or parading in a ludicrous way, for amusement.