The Collaborative International Dictionary
Deficient-ly
Deficient \De*fi"cient\, a. [L. deficiens, -entis, p. pr. of deficere to be wanting. See Defect.] 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.
--Macaulay.
Deficient number. (Arith.) See under Abundant. -- De*fi"cient-ly, adv.