Antonyms of noun truthfulness

1 sense of truthfulness

Sense 1
truthfulness -- (the quality of being truthful)
       Antonym of untruthfulness (Sense 1)
      => untruthfulness -- (the quality of being untruthful)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun truthfulness

1 sense of truthfulness

Sense 1
truthfulness -- (the quality of being truthful)
       => honesty, honestness -- (the quality of being honest)