The phrase "more blood-and-thunder" is often used to describe something that is exciting, dramatic, or sensational. However, there are also plenty of antonyms that can be used to describe something that is more subdued, understated, or low-key. Some examples of antonyms for "more blood-and-thunder" might include words like calm, peaceful, tranquil, quiet, restrained, or subtle. These words all suggest a sense of understatement and perhaps even boredom or lack of excitement, which is the opposite of the sensation that "more blood-and-thunder" evokes. Using antonyms like these can help to create a sense of contrast and balance in your writing, allowing you to highlight the contrasts and differences between different experiences and emotions.