Deficient
Deficient adjective - Falling short of a standard.
Usage example: woefully deficient eyesight kept him out of military service
Poor is a synonym for deficient in unsatisfactory topic. In some cases you can use "Poor" instead an adjective "Deficient", when it comes to topics like inadequate, defective, insufficient, lacking.
Poor
Poor adjective - Less plentiful than what is normal, necessary, or desirable.
Usage example: a poor crop because of the drought this year
Deficient is a synonym for poor in meagre topic. You can use "Deficient" instead an adjective "Poor", if it concerns topics such as inadequate, insufficient, unsatisfactory, substandard.
Mutual synonyms
Both words in one sentence
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Albinism is often linked to poor eyesight due to lack of pigment in the eyes as a result of being melanin-deficient.
Source: Literature / The Da Vinci Code -
John was a superb statesman, but deficient in moral character, and incredibly piss-poor at planning and capitalizing on situations.
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Judging by his creator's deadpan reaction to the ten-pound ball rocketing around his bowling alley, this isn't the first time Bowling Paul has tried to help out some poor bowling-deficient soul, either.
Source: The Blind Leading the Blind
Cite this Source
Poor and Deficient. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/deficient/poor
Deficient & Poor. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/deficient/poor>.
Poor or Deficient. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/deficient/poor.
Google Ngram Viewer shows how "deficient" and "poor" have occurred on timeline