[1] : The Collaborative International Dictionary of English v.0.48

sleek \sleek\, adv.
   with ease and dexterity. low
   1913 webster

[2] : The Collaborative International Dictionary of English v.0.48

sleek \sleek\, n.
   1. that which makes smooth; varnish. r.
      1913 webster

   2. a slick.
      webster 1913 suppl.

[3] : The Collaborative International Dictionary of English v.0.48

sleek \sleek\, v. t. imp.  p. p. sleeked;p. pr.  vb. n.
   sleeking.
   to make even and smooth; to render smooth, soft, and glossy;
   to smooth over.
   1913 webster

         sleeking her soft alluring locks.        --milton.
   1913 webster

         gentle, my lord, sleek o'er your rugged looks. --shak.
   1913 webster
see also:
sleeked sleeking 

[4] : The Collaborative International Dictionary of English v.0.48

sleek \sleek\ sl=ek, a. compar. sleeker sl=ek"~er;
   superl. sleekest. oe. slik; akin to icel. slimackr, and
   oe. sliken to glide, slide, g. schleichen, ohg. slimachhan,
   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
see also:
sleeker sleekest slick slink 

[5] : WordNet (r) 2.0

sleek
     adj 1: having a smooth, gleaming surface; "glossy auburn hair";
            "satiny gardenia petals"; "sleek black fur"; "silken
            eyelashes"; "silky skin"; "a silklike fabric"; "slick
            seals and otters" syn: glossy, satiny, silken,
            silky, silklike, slick
     2: well-groomed and neatly tailored; especially too
        well-groomed; "sleek figures in expensive clothes"
     v : make slick or smooth syn: slick
see also:
glossy satiny silken silky silklike slick 

[6] : Moby Thesaurus II by Grady Ward, 1.0

140 moby thesaurus words for "sleek":
   adipose, anal, balmy, blooming, blossoming, blubbery, booming,
   braw, buff, buffed, burnish, burnished, buttery, butyraceous, chic,
   chrismal, chrismatory, classy, clear, clothes-conscious,
   cosmopolitan, dapper, dashing, dinky, dressed to advantage,
   dressed to kill, elegant, exquisite, exuberant, fair, fat, fatty,
   fawning, finish, finished, flourishing, flowering, fruiting,
   furbish, furbished, genteel, glace, glance, glassy, glaze, glazed,
   gleaming, glistening, gloss, glossy, going strong, graceful,
   greasy, halcyon, hypocritical, in full swing, in good case, jaunty,
   lacquered, lardaceous, lardy, luster, lustrous, mucoid, natty,
   neat, nifty, nobby, oily, oleaginous, oleic, palmy, perfect,
   piping, polish, polished, posh, prospering, recherche, refine,
   rich, ritzy, rosy, round, rub, rubbed, satiny, scour, sebaceous,
   sharp, shellacked, shine, shining, shiny, shipshape, silken, silky,
   slick, slick down, slimy, slippery, smarmy, smart, smooth, smug,
   snazzy, snug, soapy, soigne, soignee, sophisticated, specious,
   spiffy, spruce, streamlined, style-conscious, suave, suety, swank,
   swanky, swell, tallowy, thriving, tidy, tight, tricksy, trig, trim,
   unctuous, unguent, unguentary, unguentous, varnish, varnished,
   velvety, vigorous, wax, well-cared-for, well-dressed,
   well-groomed

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Sleek, definition of term: Sleek
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