improbable
adj. 不大可能的，未必确实的；不可信的；未必会发生的
例句
It seems improbable that the current situation will continue.
当前的局势似乎不大可能继续下去。
《牛津词典》
They seem to be less realistic than folktales, like they have something improbable happening—a frog turning into a prince, say.
它们似乎没有民间故事那么真实，包含一些不太可能发生的事，比如一只青蛙变成了王子。
It all sounded highly improbable.
一切听上去很荒唐。
