Challenging and Impregnable

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Challenging adjective - Requiring considerable physical or mental effort.

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

Nearby Words: challenge, challenged, challenger

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

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Challenging and impregnable are semantically related. Sometimes you can use "Challenging" instead an adjective "Impregnable".

Cite this Source

Impregnable and Challenging. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/challenging/impregnable

Challenging & Impregnable. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/challenging/impregnable>.

Impregnable or Challenging. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/challenging/impregnable.

Google Ngram Viewer shows how "challenging" and "impregnable" have occurred on timeline