1. the quality or state of being extremely large in size, extent, or intensity

Examples

• The vastness of the ocean made her feel small and insignificant.
• Astronauts are struck by the vastness of space when they look out from the space station.
• The vastness of the desert stretched endlessly in all directions.
• She was overwhelmed by the vastness of the library’s collection.
• The vastness of his knowledge impressed everyone at the conference.
• Standing at the canyon’s edge, they marveled at the vastness below.
• The vastness of the problem required a comprehensive solution.