1. the quality or state of being deep in physical distance from top to bottom or front to back
2. the quality of being intellectually or emotionally profound; intensity of feeling or understanding
3. the quality of being dark or rich in color or tone

Examples

• The deepness of the ocean trench amazed the marine biologists.
• She spoke with a deepness of conviction that moved everyone in the room.
• The deepness of the blue paint gave the room a calm, sophisticated feel.
• The well's deepness made it difficult to retrieve the bucket.
• His deepness of thought was evident in every essay he wrote.
• The deepness of winter darkness affects many people's moods.