Honesty or truthfulness is a facet of moral character that connotes positive and virtuous attributes such as integrity, truthfulness, straightforwardness, including straightforwardness of conduct (earnestness), along with the absence of lying, cheating, theft, etc. Honesty also involves being trustworthy, loyal, fair, and sincere.

A reputation for honesty is denoted by terms like reputability and trustworthiness. Honesty about ones future conduct, loyalties, or commitments is called accountability, reliability, dependability, or conscientiousness.

Someone who goes out of their way to tell possibly unwelcome truths extends honesty into the region of candor or frankness. The Cynics engaged in a challenging sort of frankness like this called parrhêsia.