When looking for an alternative to the phrase "heavily built", one may consider various synonyms that aptly describe someone or something with a robust or sturdy constitution. Terms such as "brawny", "powerful", and "solidly built" come to mind, all highlighting a substantial physical presence. Additionally, "thickset" and "stocky" indicate a solid frame and a sense of strength. "Burly" suggests a robust physique, while "muscular" and "athletic" emphasize a strong and well-defined body. These synonyms capture the essence of a heavily built individual or object, enhancing their visual representation in our minds with their descriptive power.