Impregnable
Impregnable adjective - Incapable of being defeated, overcome, or subdued.
Terrible and impregnable are semantically related. In some cases you can use "Terrible" instead an adjective "Impregnable".
Terrible
Terrible adjective - Causing fear.
Impregnable and terrible are semantically related. Sometimes you can use "Impregnable" instead an adjective "Terrible".
Both words in one sentence
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They're inaccessible places, protected by impregnable mountains, laberintic forests, terrible rivers and ancient magic.
Source: Comic Book / Mini Monsters
Cite this Source
Terrible and Impregnable. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/impregnable/terrible
Impregnable & Terrible. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/impregnable/terrible>.
Terrible or Impregnable. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/impregnable/terrible.
Google Ngram Viewer shows how "impregnable" and "terrible" have occurred on timeline