资料来源 : pyDict

秘密地

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Confidentially \Con`fi*den"tial*ly\, adv.
   In confidence; in reliance on secrecy.

资料来源 : WordNet®

confidentially
     adv : in a confidential manner; "spoke to him intimately and
           confidentially"