[adj] ludicrously odd; "Hamlet's assumed antic disposition"; "fantastic Halloween costumes"; "a grotesque reflection in the mirror"
[adj] extraordinarily good; 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"
[adj] exceedingly or unbelievably great; "the bomb did fantastic damage"; "Samson is supposed to have had fantastic strength"; "phenomenal feats of memory"
[adj] existing in fancy only; "fantastic figures with bulbous heads the circumference of a bushel"- Nathaniel Hawthorne
[adj] extravagantly fanciful and unrealistic; foolish; "a fantastic idea of his own importance"
antic, extraordinary, fantastical, grotesque, howling(a), marvellous, marvelous, phenomenal, rattling(a), strange, terrific, tremendous, unreal, unrealistic, unusual, wonderful, wondrous