Synonyms of authentically

1 Syllable

well

2 Syllables

staunchly, really, indub, indeed, truly

3 Syllables

verily, surely, honestly, certainly, easily, actually

4 Syllables

confirmedly, assuredly, genuinely, undoubtedly, admittedly, precisely, literally

5 Syllables

absolutely, unquestionably, indubitably, positively, unmistakably

6 Syllables

legitimately, categorically