(1):
(a.) Having the nature of a phantom; unreal.
(2):
(a.) Existing only in imagination; fanciful; imaginary; not real; chimerical.
(3):
(a.) Indulging the vagaries of imagination; whimsical; full of absurd fancies; capricious; as, fantastic minds; a fantastic mistress.
(4):
(a.) Resembling fantasies in irregularity, caprice, or eccentricity; irregular; oddly shaped; grotesque.
(5):
(n.) A person given to fantastic dress, manners, etc.; an eccentric person; a fop.