Synonyms for deficient

Adjective

1. deficient, lacking(predicate), wanting(predicate), inadequate (vs. adequate)

usage: inadequate in amount or degree; "a deficient education"; "deficient in common sense"; "lacking in stamina"; "tested and found wanting"

2. insufficient (vs. sufficient), deficient, depleted, low, inadequate, poor, short, lean, lean, skimpy, light, scant(predicate), short, scarce, shy(predicate), too little, meager#1, meagre#1, meagerly

usage: of a quantity not able to fulfill a need or requirement; "insufficient funds"

3. deficient, inferior, substandard, nonstandard (vs. standard)

usage: falling short of some prescribed norm; "substandard housing"