The term 'honestness' refers to the quality of being truthful, sincere, and transparent. Its antonyms, on the other hand, depict falsehood and deceitfulness. The word 'dishonesty' reflects the opposite of honest behavior and carries negative connotations. Another antonym for 'honesty' is 'deception,' which signifies the act of tricking or deceiving someone. Likewise, 'duplicity' and 'treachery' are the traits associated with dishonesty. Other antonyms for 'honestness' include insincerity, falsehood, untruthfulness, deceit, trickery, and fraudulence. In conclusion, the antonyms for 'honestness' highlight the significance of being truthful and sincere in one's conduct and behavior.