Word · Frequency #21843
unscheduled
未列入日程的；不定期的
not scheduled; not on a regular schedule
- 1.
Not scheduled; impromptu.
未安排的；即兴的。
未安排的；即兴的。；不定期的
In use
The train made an unscheduled stop because of a signal problem.
We had to attend an unscheduled meeting this afternoon.
The system needs unscheduled maintenance after the crash.
unscheduled + noun
The manager called an unscheduled meeting to discuss the problem.
经理临时召集了一次会议来讨论这个问题。
be/become/remain + unscheduled
unscheduled 表示“未列入日程的；计划外的”，不一定指“不定期”。
The flight was unscheduled, so we had no time to prepare.
这次航班是临时安排的，所以我们没有时间准备。
Common mistakes
The meeting is unscheduled to begin at 9 a.m.The meeting is not scheduled to begin at 9 a.m.
unscheduled 是形容词，意为“未列入日程的”，不能像过去分词 scheduled 那样接不定式 to do。表示“预定做某事但没有预定”时，须用 not scheduled to do。
The buses are very unscheduled this week.The buses are very irregular this week.
unscheduled 指“不在日程表上的”，不表示“不规律的”，且通常不用 very 修饰。若要表示“发车时间不稳定、不正常”，应改用 irregular。
Connections
Collocations
- unscheduled maintenance
- 计划外维护
- The factory closed for unscheduled maintenance.工厂因计划外维护而停工。
- unscheduled stop
- 计划外停靠
- The train made an unscheduled stop.火车临时停站。
- unscheduled visit
- 临时到访
- She received an unscheduled visit from her boss.她的上司临时到访。
- unscheduled absence
- 计划外缺勤
- His unscheduled absence worried the team.他的计划外缺勤让团队很担心。
- unscheduled downtime
- 非计划停机
- The server's unscheduled downtime caused delays.服务器非计划停机造成了延误。
- unscheduled flight
Learner notes
Memory Tip
联想：un-表否定，scheduled是“已排入日程”，日历上没安排的日子就是不定期的。
Context & Register
语域：neutral 常见场景：travel timetables、maintenance schedules、visits and appointments 通常为中性用词，正式与非正式场合都能用；具体语气常随搭配不同，如 unscheduled maintenance 多用于书面通知，而 unscheduled visit 在日常对话中也不少见。
Pronunciation & Spelling
真正同韵词：scheduled（/ˈʃedjuːld/）和 rescheduled（/ˌriːˈʃedjuːld/）与 unscheduled 完全押韵。注意拼写相近但发音不同的词：schedule 和 reschedule 无词尾 /d/，module 拼作 -dule 但读作 /ˈmɒdjuːl/，mulled 拼作 -ulled 但读作 /mʌld/。
Dictionary facts from ECDICT, WIKTIONARY.