Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Impenetrable and difficult are semantically related in obscure topic. In some cases you can use "Impenetrable" instead an adjective "Difficult".
Nearby Word: difficulty
Impenetrable
Impenetrable adjective - Impossible to get through or into.
Difficult and impenetrable are semantically related in complex topic. Sometimes you can use "Difficult" instead an adjective "Impenetrable".
Nearby Words: impenetrability, impenetrably
Mutual synonyms
Related pairs
- complex and difficult
- complex and impenetrable
- tight and difficult
- tight and impenetrable
- deep and difficult
- deep and impenetrable
- heavy and difficult
- heavy and impenetrable
- profound and difficult
- profound and impenetrable
- hard and difficult
- hard and impenetrable
- tough and difficult
- tough and impenetrable
Both words in one sentence
- Problem Sleuth broke the impossible way back when they encountered a Solve the Soup Cans puzzle so utterly impenetrable and difficult that the protagonist was forced to reload from a save-state made after the puzzle was completed.
- They speak as only the French can speak, as if it is not enough for a concept to be difficult, it must be impenetrable.
Source: Fauxlosophic Narration -
At first, it was nearly impenetrable and could only be gotten through a particularly difficult sidequest for the Brotherhood Of Steel.
Source: Video Game / Fallout
Cite this Source
Impenetrable and Difficult. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/difficult/impenetrable
Difficult & Impenetrable. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/difficult/impenetrable>.
Impenetrable or Difficult. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/difficult/impenetrable.
Google Ngram Viewer shows how "difficult" and "impenetrable" have occurred on timeline