1. Having an even, smooth surface; smooth; hence, glossy; as, sleek hair. So sleek her skin, so faultless was her make. (Dryden)
2. Not rough or harsh. Those rugged names to our like mouths grow sleek. (milton)
Origin: OE. Slik; akin to Icel. Slikr, and OE. Sliken to glide, slide, G. Schleichen, OHG. Slihhan, D. Slik, slijk, mud, slime, and E. Slink. Cf. Slick, Slink.