unprepared
adj. 无准备的；即席的；尚未准备好的
例句
Our enemies were caught unprepared and we disposed of them without firing a single shot.
我们打了它个措手不及，一枪没放就把他们收拾掉了。
《新英汉大辞典》
Nijay represents a large and growing group of Americans: first-generation college students who enter school unprepared or behind.
尼杰代表了一个庞大且在不断壮大的美国群体：入学时毫无准备或落后的第一代大学生。
She was totally unprepared for his response.
她对他的反应毫无准备。
《牛津词典》
