Slick

1 adjective - done or operating in an impressively smooth and efficient way.

2 glibly assured.

3 (of skin or hair) smooth and glossy. 4 (of a surface) smooth, wet, and slippery, noun a smooth patch of oil, especially on the sea.

4 verb - 1 make (hair) flat and slick with water, oil, or cream.

5 (slick up) N. Amer. make smart, tidy, or stylish.

  — DERIVATIVES slickly adverb slickness noun.

  — ORIGIN probably related to an Old Norse word meaning ‘smooth’.

in Compact Oxford English Dictionary