astonishing, amazing
C'était stupéfiant.
It was amazing.
C'est stupéfiant.
It's amazing.
— Crazy Kung‐Fu (2004)
Il est stupéfiant.
It's astonishing.
— Les Sept Samouraïs (1954)
Stupéfiant.
Amazing.
— La vie est belle (1997)
Ce truc est stupéfiant.
This stuff is amazing.