The antonyms for the word "more shatterable" could include terms like sturdy, robust, durable, or tough. These terms refer to objects that are not easily broken, and can withstand force or pressure. For instance, a sturdy glass could survive a fall from a table, while a shatterable one would break immediately. Similarly, a robust glass could be filled with hot liquid without cracking, while a shatterable one would shatter under such stress. Therefore, when describing objects or materials, it is important to consider their strength and resilience to determine their suitability for different purposes.