Not possible
Unthinkable and not possible are semantically related. In some cases you can use "Unthinkable" instead an adjective phrase "Not possible".
Unthinkable
Unthinkable adjective - Too extraordinary or improbable to believe.
Not possible and unthinkable are semantically related. You can use "Not possible" instead an adjective "Unthinkable".
Nearby Word: unthinking
Cite this Source
Unthinkable and Not possible. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/not_possible/unthinkable
Not possible & Unthinkable. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/not_possible/unthinkable>.
Unthinkable or Not possible. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/not_possible/unthinkable.
Google Ngram Viewer shows how "not possible" and "unthinkable" have occurred on timeline