Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Impregnable and difficult are semantically related. In some cases you can use "Impregnable" instead an adjective "Difficult".
Nearby Word: difficulty
Impregnable
Impregnable adjective - Incapable of being defeated, overcome, or subdued.
Difficult and impregnable are semantically related. Sometimes you can use "Difficult" instead an adjective "Impregnable".
Mutual synonyms
Both words in one sentence
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Difficult but Awesome: Cap can throw his shield in front of him, or also diagonal up or diagonal down, it's hard sometimes to hit a target, but with enough practice, this becomes an almost impregnable defense system.
Cite this Source
Impregnable and Difficult. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/difficult/impregnable
Difficult & Impregnable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/difficult/impregnable>.
Impregnable or Difficult. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/difficult/impregnable.
Google Ngram Viewer shows how "difficult" and "impregnable" have occurred on timeline