Definition of fantastic

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