deficient

adjectives

inadequate in amount or degree

"a deficient education"; "deficient in common sense"; "lacking in stamina"; "tested and found wanting"

deficient, lacking, wanting

is derived from

of a quantity not able to fulfill a need or requirement

"insufficient funds"

deficient, insufficient

is derived from

falling short of some prescribed norm

"substandard housing"

deficient, inferior, substandard

is derived from