Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Sullen and difficult are semantically related. In some cases you can use "Sullen" instead an adjective "Difficult".
Nearby Word: difficulty
Both words in one sentence
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Tennyson and the Pre-Raphaelites would have found it difficult to recognize this rather sullen and unsatisfactory child with the ugly face, who did not disclose to anybody that he was living on dreams and prayers.
Source: Broken Ace
Cite this Source
Sullen and Difficult. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/difficult/sullen
Difficult & Sullen. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/difficult/sullen>.
Sullen or Difficult. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/difficult/sullen.
Google Ngram Viewer shows how "difficult" and "sullen" have occurred on timeline