Deficient
Deficient adjective - Lacking some necessary part.
Thickheaded and deficient are semantically related. In some cases you can use "Thickheaded" instead an adjective "Deficient".
Thickheaded
Thickheaded adjective - Not having or showing an ability to absorb ideas readily.
Deficient and thickheaded are semantically related. Sometimes you can use "Deficient" instead an adjective "Thickheaded".
Mutual synonyms
Cite this Source
Thickheaded and Deficient. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/deficient/thickheaded
Deficient & Thickheaded. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/deficient/thickheaded>.
Thickheaded or Deficient. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/deficient/thickheaded.
Google Ngram Viewer shows how "deficient" and "thickheaded" have occurred on timeline