a. without preparation; not prepared for
a. 无准备的, 即席的, 不期而遇的
1. I felt unprepared for the exam because I didn't study enough.
我觉得对这次考试没有准备好，因为我没有足够的复习。
2. The team was unprepared for the sudden change in the weather.
团队对突如其来的天气变化感到没有准备。
3. She arrived at the meeting unprepared and struggled to answer questions.
她在会议上没有准备好，回答问题时很挣扎。