1. the quality of being gentle, relaxed, or calm in character or mood
2. the quality of being soft, smooth, or pleasant in sound, taste, or appearance
3. the quality of being mature or well-developed, especially referring to wine or fruit

Examples

• The mellowness of his voice made everyone feel at ease.
• Age had brought a certain mellowness to her once fiery personality.
• The wine’s mellowness improved with each passing year.
• The mellowness of the autumn light created a peaceful atmosphere.
• His mellowness in old age surprised those who knew him as a young man.
• The mellowness of the jazz saxophone filled the room.
• The fruit’s mellowness indicated it was perfectly ripe.