Impervious
Impervious adjective - Impossible to get through or into.
Usage example: the rain forest is impervious to all but the most dedicated explorers
Tough and impervious are semantically related. In some cases you can use "Tough" instead an adjective "Impervious".
Nearby Word: imperviously
Tough
Tough adjective - Not easily chewed.
Impervious and tough are semantically related. Sometimes you can use "Impervious" instead an adjective "Tough".
Mutual synonyms
Both words in one sentence
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As tough as they are and even with their regenerative abilities, they're not impervious to sustained gunfire from either small arms or larger.
Source: Film / Underworld - Nutty Nut has a protagonist with a half-dozen alternate personalities, such as Tough Guy (impervious to pain and will beat you up for looking at him funny), the Clown, the Magician (who can do actual magic) and the Dog (don't... don't ask).
Source: Funny Schizophrenia
Cite this Source
Tough and Impervious. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/impervious/tough
Impervious & Tough. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/impervious/tough>.
Tough or Impervious. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/impervious/tough.
Google Ngram Viewer shows how "impervious" and "tough" have occurred on timeline