fairdealing

Their office was such an important one for the well-being of the scholars that it was found convenient to extend to them the privileges and protection of the University, and in return to exact an oath of fairdealing from them. 10.5

Old English Libraries; The Making, Collection and Use of Books During the Middle Ages 1911

I don't believe they understand our American fairdealing and sincerity.

A Foregone Conclusion William Dean Howells 1878

For the Cilicians say that they know nobody who was in those days more fairdealing in business, or more devout to the deity, or more disagreeable to his enemies, or more faithful to his friends; insomuch that all who had any dealings with him desired to hear the reason of this change, not thinking that so great a reformation of character could have proceeded from chance, and their idea was correct, as his narrative to Protogenes and others of his great friends showed.

Plutarch's Morals 46-120? Plutarch