Impenetrable
Impenetrable adjective - Impossible to get through or into.
Safe and impenetrable are semantically related. in secure topic. In some cases you can use "Safe" instead an adjective "Impenetrable".
Nearby Words: impenetrability, impenetrably
Safe
Safe adjective - Not exposed to the threat of loss or injury.
Impenetrable and safe are semantically related. Sometimes you can use "Impenetrable" instead an adjective "Safe".
Mutual synonyms
Both words in one sentence
-
It's very easy to lure your enemies from their perfectly safe and impenetrable positions by engaging them at long distance - they will abandon their posts in a blind charge.
Source: Video Game / Wasteland 2 - The safe is stated to be nigh-impenetrable, so they just rip it right out of the wall and take their sweet time breaking into it later.
Source: Steal the Surroundings -
Normally it's perfectly safe (no, really!), but when Opal City has an absolutely impenetrable force field around it, and the Bodines attack Adam Strange and his jury-rigged Zeta Beam device...well, let's just say it's a good thing we don't see exactly how Ms.
Source: Comicbook / Starman
Cite this Source
Safe and Impenetrable. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/impenetrable/safe
Impenetrable & Safe. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/impenetrable/safe>.
Safe or Impenetrable. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/impenetrable/safe.
Google Ngram Viewer shows how "impenetrable" and "safe" have occurred on timeline