Honesty was the state of telling the truth to individuals. Individuals who were honest generally did not tell lies.
In 2366, Jean-Luc Picard noted to Data that excessive honesty could be disastrous, particularly in a commander, as advertising one's limitations to a crew could damage credibility as a leader. (TNG: "The Ensigns of Command")
In 2371, when Commander Chakotay asked Lieutenant Tuvok if he could ask him to be honest with him, Tuvok replied that as a Vulcan he was at all times honest. Chakotay argued that this was not true as Tuvok had pretended to be Maquis in order to infiltrate his crew, but Tuvok stated that he had been honest to his convictions within the defined parameters of his mission. Chakotay complained that this was easy for him, but Tuvok argued that the demands on a Vulcan's character were difficult and that Chakotay was mistaking composure for ease. (VOY: "State of Flux")