Deficient
Deficient adjective - Falling short of a standard.
Usage example: woefully deficient eyesight kept him out of military service
Faulty is a synonym for deficient in defective topic. In some cases you can use "Faulty" instead an adjective "Deficient", when it comes to topics like unsatisfactory, imperfect. popular alternative
Mutual synonyms
Cite this Source
Faulty and Deficient. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/deficient/faulty
Deficient & Faulty. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/deficient/faulty>.
Faulty or Deficient. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/deficient/faulty.
Google Ngram Viewer shows how "deficient" and "faulty" have occurred on timeline