False-heartedness can be described in numerous ways to convey the same idea. Synonyms for false-heartedness include duplicity, deceitfulness, insincerity, treachery, perfidy, disloyalty, faithlessness, betrayal, hypocrisy, and double-dealing. These words depict the trait of being dishonest and untrustworthy, especially in matters of loyalty and commitment. Duplicity and deceitfulness point towards being two-faced and misleading, whereas insincerity and hypocrisy refer to concealing true intentions. Treachery and perfidy signify betrayal, while disloyalty and faithlessness indicate a lack of commitment. Double-dealing is another term that exemplifies false-heartedness and involves being deceitful in one's actions and intentions. All these synonyms for false-heartedness have a negative connotation and provide a clear understanding of being unfaithful and dishonest.