Clear
Clear adjective - Easily seen through.
Impregnable and clear are semantically related. In some cases you can use "Impregnable" instead an adjective "Clear".
Impregnable
Impregnable adjective - Incapable of being defeated, overcome, or subdued.
Clear and impregnable are semantically related. Sometimes you can use "Clear" instead an adjective "Impregnable".
Mutual synonyms
Both words in one sentence
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Barring that, so long as the occupants don't have a clear line of fire at you through a window, simply blocking the door of an enemy bolthole can instantly turn a nigh-impregnable bunker into a prison.
Source: Cutting the Knot
Cite this Source
Impregnable and Clear. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/clear/impregnable
Clear & Impregnable. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/clear/impregnable>.
Impregnable or Clear. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/clear/impregnable.
Google Ngram Viewer shows how "clear" and "impregnable" have occurred on timeline