deficient
Concise Oxford English Dictionary © 2008 Oxford University Press:
deficient /dɪˈfɪʃ(ə)nt/
▶adjective not having enough of a specified quality or ingredient: a diet deficient in vitamin B.
■ insufficient or inadequate.
– derivatives
deficiently adverb.
deficiently adverb.
'deficient' also found in these Oxford entries:

