say it: di-FISH-uhnt
deficient is an adjective meaning "inadequate in amount or degree". It carries 3 recorded senses.
inadequate in amount or degree
“a deficient education”
“deficient in common sense”
“lacking in stamina”
“tested and found wanting”
falling short of some prescribed norm
“substandard housing”
Definitions, synonyms and semantic relations for deficient come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.