The term "most shatterable" refers to something that is easily broken or shattered. Antonyms for this expression could be "durable," "sturdy," "robust," or "resilient," which all suggest qualities of strength and resistance to damage. Another antonym could be "flexible," implying an ability to bend or withstand external pressures without breaking. Additionally, the words "unbreakable" and "indestructible" are antonyms that suggest an extreme level of durability, indicating that no amount of force or impact can damage the object. Overall, antonyms for "most shatterable" focus on characteristics of toughness and resistance, rather than the fragility and susceptibility to damage.