Antonyms for the word "more casuistic" can include straightforward, honest, ethical, genuine, sincere, and principled. These words denote a behavior or attitude that is characterized by a lack of deceit or manipulation, and a refusal to bend the rules for personal gain. While a casuistic approach may involve justifying questionable actions, these antonyms emphasize the importance of upholding a high standard of integrity and morality in one's decisions and interactions with others. Employing these antonyms can help individuals foster relationships built on trust and authenticity, rather than relying on cleverness or manipulation to achieve their goals.