The phrase "leaved no stone unturned" means to exhaust all possibilities or leave no effort unmade. Its antonyms could include words and phrases like "gave up easily," "half-hearted attempt," "didn't try hard enough," or "gave up at the first hurdle." Other antonyms might include "half-baked," "incomplete," "superficial," "shallow," or "unsystematic." These words imply a lack of dedication, persistence, or thoroughness. They suggest that the person did not take the task seriously or did not invest the time and energy required to achieve success. In contrast, the phrase "leaved no stone unturned" implies a strong work ethic, perseverance, and a commitment to excellence.