Insoluble
Insoluble adjective - Incapable of being solved or accomplished.
Usage example: the seemingly insoluble mystery concerning the identity of the people who built these ancient structures
Undoable and insoluble are semantically related. In some cases you can use "Undoable" instead an adjective "Insoluble".
Nearby Word: insolubility
Undoable
Undoable adjective - Incapable of being solved or accomplished.
Usage example: a combat mission of that type is not only undoable, it's foolish
Cite this Source
Undoable and Insoluble. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/insoluble/undoable
Insoluble & Undoable. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/insoluble/undoable>.
Undoable or Insoluble. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/insoluble/undoable.
Google Ngram Viewer shows how "insoluble" and "undoable" have occurred on timeline