1. superlative form of false; most untrue or incorrect
2. superlative form of false; most deceptive or dishonest

Examples

• That was the falsest statement he had ever made.
• She gave the falsest smile when congratulating her rival.
• The falsest rumors spread the fastest through social media.
• His falsest promise was that he would never lie again.
• The witness provided the falsest testimony in the entire trial.
• Among all the fake documents, this one looked the falsest.