Authentically

(adv.) In an authentic manner; with the requisite or genuine authority.

Thesaurus Entries

absolutely, actually, all joking aside, artlessly, authentically, bluffly, bluntly, broadly, brusquely, candidly, de facto, directly, frankly, guilelessly, honestly, in actuality, in all conscience, in all seriousness, in effect, in fact, in plain English, in plain words, in reality, ingenuously, legitimately, manifestly, naturally, obviously, openheartedly, openly, outspokenly, plain-spokenly, plainly, positively, really, roundly, simply, sincerely, straightforwardly, truly, unaffectedly, unassumedly, unconstrainedly, unreservedly, unrestrainedly, veridically, veritably, warts and all, with no nonsense