"deficient" in the adjective sense
1. deficient, lacking, wanting
inadequate in amount or degree
"a deficient education"
"deficient in common sense"
"lacking in stamina"
"tested and found wanting"
2. insufficient, deficient
of a quantity not able to fulfill a need or requirement
"insufficient funds"
3. deficient, inferior, substandard
falling short of some prescribed norm
"substandard housing"
Source: WordNet® (An amazing lexical database of English)
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