Truthlessly refers to describing a situation where truth is absent or something that is done without honesty or integrity. Some synonyms for truthlessly include deceitfully, untruthfully, dishonestly, inaccurately, and disingenuously. Deceitful implies a deliberate attempt to mislead or deceive someone while untruthful refers to a lack of truth-telling or honesty. Dishonest implies a tendency to lie and engage in fraudulent behavior, and inaccurate refers to the presence of errors or mistakes in a statement or description. Lastly, disingenuous implies insincerity or a lack of honesty in the way someone presents themselves. All these synonyms for truthlessly aptly capture the idea of a lack of truth.