improbable

形容词 improbable:

1. not likely to be true or to occur or to have occurred
   同义词：unlikely
2. having a probability too low to inspire belief
   同义词：unbelievable, unconvincing, unlikely
3. too improbable to admit of belief
   同义词：marvelous, marvellous, tall

1. The state of being unlikely or improbable; improbability.
   不可能不大可能或不可能的状态; 不可能性
2. A light dramatic work in which highly improbable plot situations, exaggerated characters, and often slapstick elements are used for humorous effect.
   轻喜剧一种轻松的戏剧形式，其中极为荒谬可笑的情节背景，夸张的角色和一些闹剧的成分以表现幽默的效果

im.prob.a.ble

adj.（形容词）
Unlikely to take place or be true.
未必发生的，未必确实的

【引伸】
improb.ableness
n.（名词）
improb.ably
adv.（副词）