Falsehearted, meaning insincere or deceitful, has several antonyms that represent the opposite values. The first antonym is candid, which means honest and truthful. A candid person is an open book who always speaks the truth. Another antonym is reliable, which signifies a trustworthy and dependable person. An individual who is true to their word and delivers what they promise is undoubtedly reliable. Sincere is another opposite of falsehearted, and it characterizes individuals who express genuine emotions and heartfelt intentions. A sincere person is honest and steadfast, and their intentions are pure. Last but not least is the antonym loyal, which represents unwavering devotion and faithfulness. Loyalty is an excellent trait that exemplifies steadfastness and unshakeable trustworthiness.