Deficient /(?)/

De·fi·cient

Deficient

a.
  1. 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.
    The style was indeed deficient in ease and variety.

Phrases & Compounds
Deficient number
See under Abundant.