Unexpected and Unplanned

Unexpected

Unexpected adjective - Not expected.
Usage example: the failure of the backup generator was unexpected and a contingency for which we weren't prepared

Unplanned is a synonym for unexpected in chance topic. In some cases you can use "Unplanned" instead the word "Unexpected" as an adjective or an adverb.

Nearby Words: unexpectedly, unexpectedness

Unplanned

Unplanned adjective - Happening by chance.
Usage example: an unplanned change in our itinerary—we got lost!

Unexpected is a synonym for unplanned in chance topic. You can use "Unexpected" instead the word "Unplanned" as an adjective or an adverb, if it concerns topics such as not planned.
Cite this Source
Unplanned and Unexpected. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/unexpected/unplanned
Unexpected & Unplanned. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/unexpected/unplanned>.
Unplanned or Unexpected. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/unexpected/unplanned.
Google Ngram Viewer shows how "unexpected" and "unplanned" have occurred on timeline