deficient

Adjective

• falling short of some prescribed norm
  • substandard housing
    

• of a quantity not able to fulfill a need or requirement
  • insufficient funds
    

• inadequate in amount or degree
  • a deficient education
    
  • deficient in common sense
    
  • lacking in stamina
    
  • tested and found wanting
    

Related words

• Synonyms: 
  inferior , substandard , insufficient , lacking(p) , wanting(p)