Dictionary
de•fi•cient
Pronunciation: (di-fish'unt), [key]—
adj.
1. lacking some element or characteristic; defective:
deficient in taste.
2. insufficient; inadequate:
deficient knowledge.
—
n.
a person who is deficient, esp. one who is mentally defective.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.