Something not included in plans or schedules; an unexpected or unscheduled event or state.
予定外の出費があって、今月は節約しなければならない。
There was an unexpected expense, so I have to save money this month.
予定外に会議が長引いて、帰りが遅くなった。
The meeting unexpectedly ran long, and I got home late.
予定外の来客があったので、急いで部屋を片付けた。
Because of an unplanned visitor, I hurriedly tidied the room.