Muscular, brawny, sinewy, sturdy, beefy, robust, powerful, athletic, toned, firm, strong, resilient, solid, well-built, Herculean, stout, buffed, ripped, chiseled, vigorous. All these synonyms can be used to describe something or someone that is like a muscle. Whether referring to a person's physique or an object's strength, these words can add a sense of intensity and power to your writing. For example, instead of saying someone has "muscle-like" arms, you could describe their arms as "brawny" or "sinewy". By using these synonyms, you can give your writing a more descriptive and impactful tone.