not capable of being imagined or grasped mentally; unbelievable 不能想象的;不可理解的;难以置信的 [with clause]it seemed inconceivable that the president had been unaware of what was going on. 总统竟没有察觉到正在发生什么,这是令人难以置信的。 they behaved with inconceivable cruelty. 他们的行为残忍到难以置信。