Diffident
Diffident adjective - Not comfortable around people.
Impervious and diffident are semantically related. In some cases you can use "Impervious" instead an adjective "Diffident".
Nearby Words: diffidence, diffidently
Impervious
Impervious adjective - Not allowing penetration (as by gas, liquid, or light).
Diffident and impervious are semantically related. Sometimes you can use "Diffident" instead an adjective "Impervious".
Nearby Word: imperviously
Cite this Source
Impervious and Diffident. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/diffident/impervious
Diffident & Impervious. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/diffident/impervious>.
Impervious or Diffident. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/diffident/impervious.
Google Ngram Viewer shows how "diffident" and "impervious" have occurred on timeline