unscheduled

adj

1. (not-comparable)Not scheduled; impromptu.

   “There were two further unscheduled stops, one at a small station, Skalice, where a small party of tourists entrained, and at Břeclav, a junction and customs post on the Austrian frontier.”

   “Because most diesel failures can be traced to electrical faults, minor in themselves but often difficult to pin-point, any unscheduled halt during a trial run is often the signal for the frenzied unfolding of wiring diagrams and the appearance of an impressive array of voltmeters and circuit testers.”

   “RUD stands for “rapid unscheduled disassembly” – a fancy way to say “crashed.””

   “He contacted the Rail Operating Centre in York to request an unscheduled stop at Huntingdon, which was arranged.”

2. (India, not-comparable)Not scheduled in the political sense.