sleekadj.

sleeksleek: [16] Sleek originated as a variant form of slick [14], which probably went back to an unrecorded Old English *slice. It apparently has relatives in Icelandic slíkja and Norwegian slikja ‘smoothen’.=> slicksleek (adj.)1580s, variant of Middle English slike (see slick (adj.)). Originally of healthy-looking animal hair; applied to persons 1630s, with sense of "plump and smooth-skinned." Figurative meaning "slick, fawning, flattering" is from 1590s.sleek (v.)"make sleek," mid-15c., a variant of slick (v.). Related: Sleeked; sleeking.