unexpectedness
n. 出乎意外,突然
例句
The unexpectedness of my father's death meant that his affairs were not entirely in order.
我父亲的意外过世意味着他的个人事情不是完全有序。
《柯林斯英汉双解大词典》
Note this appears to conflict with unexpectedness above.
注意:这似乎与上述冲突始料未及。
The sheer unexpectedness of it made my hair stir under my cap.
这猝不及防的惊变,使我帽子下面的头发都竖起来。