Confidentially
Pronunciation : Con`fi*den"tial*ly
Part of Speech : adv.
Definition : Defn: In confidence; in reliance on secrecy.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder