1. most smooth and shiny in appearance
Usage: superlative form of sleek
2. most streamlined or elegantly designed
Usage: superlative form of sleek

Examples

• The cat had the sleekiest coat after its grooming session.
• This is the sleekiest sports car in the showroom.
• Her hair looked sleekiest when she used that new conditioner.
• The sleekiest design won the architecture competition.
• Among all the laptops, this model has the sleekiest profile.
• The seal’s sleekiest fur helped it glide through the water effortlessly.