Convincingly
Pronunciation : Con*vin"cing*ly
Part of Speech : adv.
Definition : Defn: in a convincing manner; in a manner to compel assent.
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