The term "tumble-down" refers to something in a state of disrepair or dilapidation. The antonyms of "more tumble-down" are "pristine," "well-maintained," and "flawless." A pristine property is in excellent condition, free from any damage or wear and tear. A well-maintained item is regularly looked after and kept in top shape, preventing any deterioration. Similarly, a flawless object is entirely without faults or defects. These antonyms offer a sense of serenity, security, and confidence, while the term "tumble-down" gives the opposite impression of a structure that has fallen apart and may be dangerous.