1. ludicrously odd - Hamlet's assumed antic disposition - fantastic Halloween costumes - a grotesque reflection in the mirror • Syn: antic, fantastic, grotesque • Similar to: strange, unusual • Derivationally related forms: grotesqueness (for: grotesque), antic (for: antic) 2. existing in fancy only - "fantastic figures with bulbous heads the circumference of a bushel"- Nathaniel Hawthorne • Syn: fantastic • Similar to: unreal • Derivationally related forms: fantasy, fantasy (for: fantastic)