Definition of "ingenuously"

Let us ingenuously confesse that only God and Faith hath told it us: for it is no lesson of Nature, nor comming from our reason.

1603, Michel de Montaigne, chapter 12, in John Florio, transl., The Essayes […], book II, London: […] Val[entine] Simmes for Edward Blount […]

Yet this in Duty and Modesty I may ingenuously confess, My Royal Husband is oto far seduced, his Ear is too open, his Will too violent, and his Heart too free, to those bewitching Syrens, that make his Errors their Profit and Glory.

c. 1620s, Elizabeth Cary [misattributed to Henry Cary], The History Of the most unfortunate Prince King Edward II. […] , London: A.G. and F. P., published 1680, page 41

I must ingenuously acknowledge the chief Motive of my leaving her was the Present of a New-Year's-Gift she made me; but whether French or Neopolitan, I leave to the Determination of the Sons of Galen.

1723, Charles Walker, Memoirs of Sally Salisbury, section V