Impassive
Impassive adjective - Not feeling or showing emotion.
Unpierceable and impassive are semantically related In some cases you can use "Unpierceable" instead an adjective "Impassive".
Unpierceable
Impassive and unpierceable are semantically related in unable to be penetrated topic. You can use "Impassive" instead an adjective "Unpierceable".
Mutual synonyms
Cite this Source
Unpierceable and Impassive. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/impassive/unpierceable
Impassive & Unpierceable. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/impassive/unpierceable>.
Unpierceable or Impassive. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/impassive/unpierceable.
Google Ngram Viewer shows how "impassive" and "unpierceable" have occurred on timeline