The phrase "came apart at the seams" denotes a certain level of failure, chaos, or disintegration. Antonyms for this phrase would be "holding together," "strong," and "intact." These words imply cohesion, unity, and stability. "Holding together" refers to something that is functioning well and without resistance. "Strong" implies durability, withstanding pressure, and being reliable. "Intact" refers to something unbroken, undamaged, and complete. Using these antonyms for "came apart at the seams" can create a sense of order, strength, and reliability in a sentence.