Definition of "sleek"

sleek

/sliːk/

adjective
comparative sleeker, superlative sleekest
1. Having an even, smooth surface; smooth
  Quotations
  So sleek her skin, so faultless was her make.
  1717, John DrydenSamuel Garthet al., “Book 1”, in Metamorphoses, translation of Metamorphoses by Ovid, line 837
2. Glossy.
3. Not rough or harsh.
  Quotations
  Those rugged names to our like mouths grow sleek.
  1673, John Milton, “Sonnet 11”, in Poems, line 10
4. Slim and streamlined; not plump, thick, or stocky.
5. Healthy, well-fed and well-groomed; in good condition. (of stock animals)
6. Dated form of slick (“convincing but untrustworthy”).
  Quotations
  'Are these the Carrara marbles?' the lady queried. 'Yes, madam,' responded the sleek salesman.
  1892, The Critic, volume 20, page 229
adverb
comparative more sleek or sleeker, superlative most sleek or sleekest
1. (dated) With ease and dexterity.
verb
third-person singular simple present sleeks, present participle sleeking, simple past and past participle sleeked
1. (transitive) To make smooth or glossy; to polish.
  Quotations
  The sloping brush sleeks the surface.
  1895, The New Technical Educator, page 258
2. (transitive, dated) To calm or soothe.
3. (intransitive, dated) To glide.
noun
uncountable
1. That which makes smooth; varnish.