Source : Webster's Revised Unabridged Dictionary (1913)

Sufficiently \Suf*fi"cient*ly\, adv.
   To a sufficient degree; to a degree that answers the purpose,
   or gives content; enough; as, we are sufficiently supplied
   with food; a man sufficiently qualified for the discharge of
   his official duties.

Source : WordNet®

sufficiently
     adv : to a sufficient degree; "she was sufficiently fluent in
           Mandarin" [ant: {insufficiently}]