To be sedulous is to be diligent, assiduous, and hardworking. Synonyms for the word sedulous also include meticulous, thorough, and conscientious. When someone is sedulous, they put in great effort and attention to detail to achieve their goals and complete tasks to the best of their ability. Other synonyms for sedulous include persistent, dedicated, and tenacious. A sedulous person is also characterized by being focused, disciplined, and committed to their work. Overall, being sedulous is a valuable quality that ensures success and achievement in any undertaking.