Unacceptable and Unendurable

Unacceptable

Unacceptable adjective - Used of persons or their behavior.

Unendurable is a synonym for unacceptable. In some cases you can use "Unendurable" instead an adjective "Unacceptable".

Nearby Word: unaccepted

Unendurable

Unendurable adjective - More than can be put up with.
Usage example: people used to travel along this stretch of the highway by night so as to avoid the unendurable heat of the day

Unacceptable is a synonym for unendurable in intolerable topic. You can use "Unacceptable" instead an adjective "Unendurable", if it concerns topics such as unbearable.
Cite this Source
Unendurable and Unacceptable. (2016). Retrieved 2026, August 10, from https://thesaurus.plus/related/unacceptable/unendurable
Unacceptable & Unendurable. N.p., 2016. Web. 10 Aug. 2026. <https://thesaurus.plus/related/unacceptable/unendurable>.
Unendurable or Unacceptable. 2016. Accessed August 10, 2026. https://thesaurus.plus/related/unacceptable/unendurable.
Google Ngram Viewer shows how "unacceptable" and "unendurable" have occurred on timeline