1. the quality or state of being massive; great size, bulk, or weight
2. the quality of being impressive in scale or extent

Examples

• The massiveness of the cathedral left visitors speechless.
• The bridge’s massiveness made it seem indestructible.
• She was struck by the massiveness of the mountain range.
• The massiveness of the project required years of planning.
• The statue’s massiveness dominated the entire plaza.
• The massiveness of the data collection effort was unprecedented.