antic, fantastic, fantastical, grotesque - ludicrously odd
Example:- Hamlet's assumed antic disposition
fantastic, wild - fanciful and unrealistic; foolish
Example:- a fantastic idea of his own importance
fantastic - extravagantly fanciful in design, construction, appearance
Example:- Gaudi's fantastic architecture
fantastic, grand, howling, marvellous, marvelous, rattling, terrific, tremendous, wonderful, wondrous - extraordinarily good or great ; used especially as intensifiers
Example:- a fantastic trip to the Orient
fantastic, fantastical - existing in fancy only
Example:- fantastic figures with bulbous heads the circumference of a bushel