Fast and Thickheaded
Opposite meaning words
Fast
Fast adjective - Having or showing quickness of mind.
Usage example: I don't know how to operate this machine, but I'm a fast learner
Thickheaded is an antonym for fast.
Thickheaded
Thickheaded adjective - Not having or showing an ability to absorb ideas readily.
Usage example: don't suppose that he's thickheaded just because he doesn't understand English very well
Fast is an antonym for thickheaded.
Cite this Source
Thickheaded and Fast. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/fast/thickheaded
Fast & Thickheaded. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/fast/thickheaded>.
Thickheaded or Fast. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/fast/thickheaded.
Google Ngram Viewer shows how "fast" and "thickheaded" have occurred on timeline