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" ;