Impregnable
Impregnable adjective - Incapable of being defeated, overcome, or subdued.
Perilous and impregnable are semantically related. In some cases you can use "Perilous" instead an adjective "Impregnable".
Perilous
Perilous adjective - Involving potential loss or injury.
Impregnable and perilous are semantically related. Sometimes you can use "Impregnable" instead an adjective "Perilous".
Nearby Words: peril, perilously, periled
Mutual synonyms
Cite this Source
Perilous and Impregnable. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/impregnable/perilous
Impregnable & Perilous. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/impregnable/perilous>.
Perilous or Impregnable. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/impregnable/perilous.
Google Ngram Viewer shows how "impregnable" and "perilous" have occurred on timeline