unscheduled
adj. 事先未安排的；不按计划的
例句
The ship made an unscheduled stop at Hawaii.
船在夏威夷做了一次计划外的停靠。
《柯林斯英汉双解大词典》
The aircraft made an unscheduled landing at Logan after developing an electrical fault.
飞机发生电气故障后，临时在洛根着陆。
This is an unscheduled stop in a day crammed with appointments.
这次停留在排满约会的一天中并未事先安排。
