Impenetrable
Impenetrable adjective - Impossible to get through or into.
Unobtainable and impenetrable are semantically related. In some cases you can use "Unobtainable" instead an adjective "Impenetrable".
Nearby Words: impenetrability, impenetrably
Unobtainable
Unobtainable adjective - Hard or impossible to get to or get at.
Impenetrable and unobtainable are semantically related. Sometimes you can use "Impenetrable" instead an adjective "Unobtainable".
Mutual synonyms
Cite this Source
Unobtainable and Impenetrable. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/impenetrable/unobtainable
Impenetrable & Unobtainable. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/impenetrable/unobtainable>.
Unobtainable or Impenetrable. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/impenetrable/unobtainable.
Google Ngram Viewer shows how "impenetrable" and "unobtainable" have occurred on timeline