Mental dishonesty can be defined as a lack of integrity in one's thoughts and beliefs. Some synonyms for this term include deception, fraudulence, insincerity, double-dealing, and duplicity. Other words that can be used to describe mental dishonesty include deceit, falsehood, trickery, and treachery. Mental dishonesty can manifest itself in a variety of ways, such as lying to oneself, denying the truth, and fabricating stories. It is essential to recognize mental dishonesty and strive for honesty in our thoughts and beliefs to cultivate a healthy mindset and build trust with others.