adjective

1. smooth and shiny; glossy, as a highly polished surface, well-kept hair or fur, etc.
2. of well-fed or well-groomed appearance fat, sleek pigeons
3. polished in speech and behavior, esp. in a specious way; unctuous
4. highly fashionable, or stylish; elegant

Etymology: var. of slick, with Early ModE vowel lengthening

transitive verb