1. the quality or state of being blue in color
2. sadness or melancholy; a state of depression or low spirits
Usage: often used in the phrase 'the blues'

Examples

• The blueness of the sky on a clear day is breathtaking.
• She admired the blueness of the ocean from the beach.
• The blueness in his mood lifted after he heard the good news.
• The artist mixed pigments to capture the perfect blueness for the painting.
• A sense of blueness settled over him after the loss.
• The blueness of the fabric faded after several washes.