The antonyms for the term "more simplehearted" are numerous, and they include words like sophisticated, complex, complicated, insincere, cunning, deceitful, and disingenuous. The opposite of a simplehearted person is someone who is intellectually refined, emotionally detached, or manipulative. This person could be cunning and tactful in their ways, hiding their true intentions and tricking others for personal gain. They might also be excessively analytical and analytical, which often leads to an overcomplication of even the simplest issues. Overall, these antonyms for "more simplehearted" are inherently negative and denote a lack of sincerity or authenticity in one's actions and emotions.