Pertinacious
Pertinacious adjective - Continuing despite difficulties, opposition, or discouragement.
Sullen and pertinacious are semantically related. In some cases you can use "Sullen" instead an adjective "Pertinacious".
Nearby Word: pertinacity
Sullen
Sullen adjective - Causing or marked by an atmosphere lacking in cheer.
Pertinacious and sullen are semantically related. Sometimes you can use "Pertinacious" instead an adjective "Sullen".
Nearby Word: sullenly
Cite this Source
Sullen and Pertinacious. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/pertinacious/sullen
Pertinacious & Sullen. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/pertinacious/sullen>.
Sullen or Pertinacious. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/pertinacious/sullen.
Google Ngram Viewer shows how "pertinacious" and "sullen" have occurred on timeline