Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Intelligent and difficult are semantically related. In some cases you can use "Intelligent" instead an adjective "Difficult".
Nearby Word: difficulty
Intelligent
Intelligent adjective - Having or showing quickness of mind.
Difficult and intelligent are semantically related. Sometimes you can use "Difficult" instead an adjective "Intelligent".
Both words in one sentence
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She is very intelligent and difficult to con.
Source: Series / Gosei Sentai Dairanger -
Oddly, even this little line is so at odds with his later characterisation (he was retooled from a refined, cynical Bond-type into a bitter, highly-intelligent Warrior Poet, although easily for the better) it's difficult to imagine him saying it, even knowing what his voice sounds like...
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However, more intelligent Frankensteins are extremely rare and difficult to make.
Cite this Source
Intelligent and Difficult. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/difficult/intelligent
Difficult & Intelligent. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/difficult/intelligent>.
Intelligent or Difficult. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/difficult/intelligent.
Google Ngram Viewer shows how "difficult" and "intelligent" have occurred on timeline