Definition of "honestest"

To kill the honestest Man in Spain, if I be well paid.

1682, Aphra Behn, “The False Count; or, A New Way to Play an Old Game”, in The Works of Aphra Behn, Vol. III‎

Our youth, now, emboldened with his success, resolved to push the matter farther, and ventured even to beg her recommendation of him to her father's service; protesting that he thought him one of the honestest fellows in the country, and extremely well qualified for the place of a gamekeeper, which luckily then happened to be vacant.

1749, Henry Fielding, The History of Tom Jones, a Foundling

I have read diligently what books and documents about them I could come at;--with the honestest wish to admire, to love and worship them like Heroes; but I am sorry to say, if the real truth must be told, with very indifferent success!

1840, Thomas Carlyle, Heroes and Hero Worship‎