from
The Collaborative International Dictionary of English v.0.48
Sleek \Sleek\ (sl[=e]k), a. [Compar. {Sleeker} (sl[=e]k"[~e]r);
superl. {Sleekest}.] [OE. slik; akin to Icel. sl[imac]kr, and
OE. sliken to glide, slide, G. schleichen, OHG. sl[imac]hhan,
D. slik, slijk, mud, slime, and E. slink. Cf. {Slick},
{Slink}.]
1. Having an even, smooth surface; smooth; hence, glossy; as,
sleek hair. --Chaucer.
[1913 Webster]
So sleek her skin, so faultless was her make.
--Dryden.
[1913 Webster]
2. Not rough or harsh.
[1913 Webster]
Those rugged names to our like mouths grow sleek.
--Milton.
[1913 Webster]