the.com/unplanned
The future arriving early, without an appointment.
means Happening without forethought or arrangement, often catching everyone delightfully or disastrously off guard.
from The negating prefix un- clamped onto plan, from French plan and Latin planus, meaning flat or clear — ironic, since the unplanned is anything but smooth.
Famous outcomesPenicillin, microwaves, and Post-it notes were all unplanned.
Demographic termNearly half of global pregnancies are unplanned.
Linguistic cousinSits beside spontaneous, but with more shrugging.