unbelievable

adj

1. (literally)Not to be believed.

   “‘Come on, girls,’ said Steve, ‘be honest, we won.’ / ‘Yeah,’ said Raymond, ‘we let you off because you’re girls.’ / ‘You’re unbelievable,’ said Liz. / ‘Well, if we’re unbelievable,’ said Steve, ‘then you’re unbelievabler.’”

2. (figuratively)Amazing, astonishing; so surprising that one is almost, or figuratively, unable to believe.

   “The most unbelievable thing happened to me today!”

   “This restaurant makes unbelievable pizza!”

   “Whether you want the unbelievablest sheer of chiffon . . . or the most durable of service weight . . . I’ve concluded, after a round of looking, that these stores give you a real money’s worth!”

   “In other words—join the gpo and hear the world; have fun; talk to the wildest, craziest, simply unbelievablest people.”

   “The unbelievablest (to coin a word) thing about this animation is the fact that it is generated in real time, like a video game!”

3. Implausible or improbable.

   “His excuse seems rather unbelievable.”