Impenetrable
Impenetrable adjective - Impossible to get through or into.
Noiseless and impenetrable are semantically related. In some cases you can use "Noiseless" instead an adjective "Impenetrable".
Nearby Words: impenetrability, impenetrably
Noiseless
Noiseless adjective - Mostly or entirely without sound.
Impenetrable and noiseless are semantically related. Sometimes you can use "Impenetrable" instead an adjective "Noiseless".
Nearby Words: noise, noiselessly
Cite this Source
Noiseless and Impenetrable. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/impenetrable/noiseless
Impenetrable & Noiseless. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/impenetrable/noiseless>.
Noiseless or Impenetrable. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/impenetrable/noiseless.
Google Ngram Viewer shows how "impenetrable" and "noiseless" have occurred on timeline