Special
Special adjective - Added to a regular schedule.
Usage example: a special holiday flight
Unscheduled and special are semantically related. In some cases you can use "Unscheduled" instead an adjective "Special".
Unscheduled
Unscheduled adjective - Not scheduled or not on a regular schedule.
Usage example: an unscheduled meeting
Special and unscheduled are semantically related. You can use "Special" instead an adjective "Unscheduled".
Cite this Source
Unscheduled and Special. (2016). Retrieved 2026, July 31, from https://thesaurus.plus/related/special/unscheduled
Special & Unscheduled. N.p., 2016. Web. 31 Jul. 2026. <https://thesaurus.plus/related/special/unscheduled>.
Unscheduled or Special. 2016. Accessed July 31, 2026. https://thesaurus.plus/related/special/unscheduled.
Google Ngram Viewer shows how "special" and "unscheduled" have occurred on timeline