The phrase "comes apart at seams" means to completely fall apart or break down. Its antonyms would be "holds together," "stays intact," "remains solid," "stays secure," or "stays sturdy." These words suggest a situation or object that is reliable, stable, and durable. For instance, when something is built with quality materials and craftsmanship, it will hold together even under pressure or extreme conditions. Similarly, when a team or a relationship is based on trust and communication, it will stay intact and weather any challenge. Using antonyms like these create a picture of a positive outcome or a successful performance.