Deficient has 4 different meanings across 1 category:
Adjective
inadequate in amount or degree
"a deficient education"
"deficient in common sense"
"lacking in stamina"
"tested and found wanting"
of a quantity not able to fulfill a need or requirement
"insufficient funds"
falling short of some prescribed norm
"substandard housing"
Lacking something essential; often construed with in.
"The soil was deficient in nitrogen, causing the plants to grow poorly despite adequate water and sunlight."