不可思议

不可思議
bùkěsīyì
(idiom) inconceivable; unimaginable; unfathomable

CEDICT

Entry Composition

1 不可 bùkě cannot; should not; must not
2 思议 sīyì to imagine; to comprehend (usu. used in the negative, as in 不可思议 bùkěsīyì "inconceivable")