1. the quality of being smooth, glossy, and well-groomed in appearance
2. the quality of being streamlined and elegant in design or form

Examples

• The cat’s sleekness was evident in its perfectly groomed black fur.
• She admired the sleekness of the new sports car’s design.
• The dolphin’s natural sleekness helps it move efficiently through water.
• The sleekness of the modern building impressed all the visitors.
• His hair had lost its youthful sleekness and become coarse with age.
• The sleekness of the yacht made it stand out in the marina.