'Tellingly' definitions:

Definition of 'tellingly'

(from WordNet)
adverb
In a telling manner; "the plain manner of its style all the more tellingly points up the horror of the case"

Definition of 'Tellingly'

From: GCIDE
  • Telling \Tell"ing\, a. Operating with great effect; effective; as, a telling speech. -- {Tell"ing*ly}, adv. [1913 Webster]