1. the quality or state of being marvellous; extreme wonderfulness or astonishment
Usage: chiefly British spelling (American: marvelousness); abstract noun

Examples

• The marvellousness of the sunset left everyone speechless.
• She spoke with such enthusiasm about the marvellousness of the discovery.
• The marvellousness of modern technology continues to amaze us.
• Children are often struck by the marvellousness of simple natural phenomena.
• The architect's design was praised for its sheer marvellousness.
• We were captivated by the marvellousness of the performance.