'Upright' in the Bible

'I, also, far be it from me to sin against Jehovah, by ceasing to pray for you, and I have directed you in the good and upright way;

And Achish calleth unto David, and saith unto him, 'Jehovah liveth, surely thou art upright, and good in mine eyes is thy going out, and thy coming in, with me in the camp, for I have not found in thee evil from the day of thy coming in unto me till this day; and in the eyes of the princes thou art not good;