Impregnable
Impregnable adjective - Incapable of being defeated, overcome, or subdued.
Logical and impregnable are semantically related. In some cases you can use "Logical" instead an adjective "Impregnable".
Logical
Logical adjective - According to the rules of logic.
Impregnable and logical are semantically related. Sometimes you can use "Impregnable" instead an adjective "Logical".
Mutual synonyms
Both words in one sentence
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General Guame the Immovable takes this to the logical extent; he powers both his personal mech, the Gember, and his flagship, the Impregnable Fortress Dai-Gundo, by rolling into a ball and spinning in place (He's an armadillo evolved into humanoid form through sheer willpower).
Cite this Source
Logical and Impregnable. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/impregnable/logical
Impregnable & Logical. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/impregnable/logical>.
Logical or Impregnable. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/impregnable/logical.
Google Ngram Viewer shows how "impregnable" and "logical" have occurred on timeline