untruthfulness (noun)

1. The painting showcased the untruthfulness of the subject's expression, revealing the artist's intent to convey hidden emotions.

2. In some religious traditions, untruthfulness is considered a sin and is advised against in order to maintain honesty and integrity within the faith.

3. The untruthfulness of the interior design was evident in the mismatched color schemes and poorly executed furniture placement.

4. The untruthfulness of his promises of forever shattered her heart, leaving her with a sense of betrayal and longing for true love.