Deficiency :: Deficiency (n.) The state of being deficient; inadequacy; want; failure; imperfection; shortcoming; defect.
Deficient :: Deficient (a.) Wanting, to make up completeness; wanting, as regards a requirement; not sufficient; inadequate; defective; imperfect; incomplete; lacking; as, deficient parts; deficient estate; deficient strength; deficient in judgment..
Indeficiency :: Indeficiency (n.) The state or quality of not being deficient.