fantastic

ludicrously odd; "Hamlet's assumed antic disposition"; "fantastic Halloween costumes"; "a grotesque reflection in the mirror"

extraordinarily good or great ; used especially as intensifiers; "a fantastic trip to the Orient"; "the film was fantastic!"; "a howling success"; "a marvelous collection of rare books"; "had a rattling conversation about politics"; "a tremendous achievement"

fanciful and unrealistic; foolish; "a fantastic idea of his own importance"

existing in fancy only; "fantastic figures with bulbous heads the circumference of a bushel"- Nathaniel Hawthorne

extravagantly fanciful in design, construction, appearance; "Gaudi's fantastic architecture"