deficient
1. [ adjective ] inadequate in amount or degree
Synonyms: lacking wanting
Examples:

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

Related terms: inadequate
2. [ adjective ] of a quantity not able to fulfill a need or requirement
Synonyms: insufficient
Examples:

"insufficient funds"

Related terms: sufficient inadequate light too_little scarce shy lean lean depleted meager quantity
3. [ adjective ] falling short of some prescribed norm
Synonyms: substandard inferior
Examples:

"substandard housing"

Related terms: nonstandard
Similar spelling:   deficiency
  devising