The word "fracturable" refers to something that can be broken or shattered into pieces. Its antonyms are words that convey the opposite meaning, namely that the object in question cannot be broken or damaged in any way. Some potential antonyms for "fracturable" include terms like unbreakable, invulnerable, indestructible, robust, durable, and resistant. These words suggest the idea that an object is sturdy, strong, and resistant to any potential damage or harm that may come its way, and therefore cannot be easily fractured or shattered. When used together, these words serve to create a fuller, more comprehensive picture of the object's properties and capabilities.