fantastic

Ludicrously odd.

“fantastic Halloween costumes”

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”

Extraordinarily good or great; used especially as intensifiers.

“a fantastic trip to the Orient”

“the film was fantastic!”

Extravagantly fanciful in design, construction, appearance.

“Gaudi's fantastic architecture”