'Uprightness' in the Bible

And Solomon saith, 'Thou hast done with Thy servant David my father great kindness, as he walked before Thee in truth and in righteousness, and in uprightness of heart with Thee, and Thou dost keep for him this great kindness, and dost give to him a son sitting on his throne, as at this day.

And thou -- if thou dost walk before Me as David thy father walked, in simplicity of heart, and in uprightness, to do according to all that I have commanded thee -- My statutes and My judgments thou dost keep --