Impregnable and Persistent

Impregnable

Impregnable adjective - Incapable of being defeated, overcome, or subdued.

Persistent and impregnable are semantically related. In some cases you can use "Persistent" instead an adjective "Impregnable".

Persistent

Persistent adjective - Continuing despite difficulties, opposition, or discouragement.

Impregnable and persistent are semantically related. Sometimes you can use "Impregnable" instead an adjective "Persistent".

Cite this Source
Persistent and Impregnable. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/impregnable/persistent
Impregnable & Persistent. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/impregnable/persistent>.
Persistent or Impregnable. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/impregnable/persistent.
Google Ngram Viewer shows how "impregnable" and "persistent" have occurred on timeline