Dullness
Dullness noun - The quality or state of lacking intelligence or quickness of mind.
Impenetrability and dullness are semantically related. In some cases you can use "Impenetrability" instead a noun "Dullness".
Impenetrability
Impenetrability noun - The quality or state of being impossible to know, understand, or explain.
Dullness and impenetrability are semantically related. Sometimes you can use "Dullness" instead a noun "Impenetrability".
Nearby Words: impenetrable, impenetrably
Cite this Source
Impenetrability and Dullness. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/dullness/impenetrability
Dullness & Impenetrability. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/dullness/impenetrability>.
Impenetrability or Dullness. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/dullness/impenetrability.
Google Ngram Viewer shows how "dullness" and "impenetrability" have occurred on timeline