Copious
Copious adjective - Pouring forth in great amounts.
Impenetrable and copious are semantically related. In some cases you can use "Impenetrable" instead an adjective "Copious".
Nearby Word: copiously
Impenetrable
Impenetrable adjective - Impossible to get through or into.
Copious and impenetrable are semantically related. Sometimes you can use "Copious" instead an adjective "Impenetrable".
Nearby Words: impenetrability, impenetrably
Mutual synonyms
Cite this Source
Impenetrable and Copious. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/copious/impenetrable
Copious & Impenetrable. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/copious/impenetrable>.
Impenetrable or Copious. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/copious/impenetrable.
Google Ngram Viewer shows how "copious" and "impenetrable" have occurred on timeline