Impassive and Unreactive

Impassive

Impassive adjective - Not feeling or showing emotion.

Unreactive and impassive are semantically related In some cases you can use "Unreactive" instead an adjective "Impassive".

Unreactive

Unreactive adjective - (chemistry) not reacting chemically.

Impassive and unreactive are semantically related in lifeless topic. You can use "Impassive" instead an adjective "Unreactive".
Cite this Source
Unreactive and Impassive. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/impassive/unreactive
Impassive & Unreactive. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/impassive/unreactive>.
Unreactive or Impassive. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/impassive/unreactive.
Google Ngram Viewer shows how "impassive" and "unreactive" have occurred on timeline