What is the meaning of slicker?

noun

• A macintosh made from cotton fabric treated with oil and pigment to make it waterproof.
  • synonyms: oilskin
• A person with good manners and stylish clothing.
• Someone who leads you to believe something that is not true.
  • synonyms: deceiver, cheat, cheater, trickster, beguiler

adjective

• Made slick by e. G. Ice or grease.
  • usage: "sidewalks slick with ice"; "roads are slickest when rain has just started and hasn't had time to wash away the oil"
  • synonyms: slick
• Having only superficial plausibility.
  • usage: "glib promises"; "a slick commercial"
  • synonyms: glib, pat, slick
• Having a smooth, gleaming surface reflecting light.
  • usage: "glossy auburn hair"; "satiny gardenia petals"; "sleek black fur"; "silken eyelashes"; "silky skin"; "a silklike fabric"; "slick seals and otters"
  • synonyms: satiny, sleek, silken, silky, silklike, slick
• Marked by skill in deception.
  • usage: "cunning men often pass for wise"; "deep political machinations"; "a foxy scheme"; "a slick evasive answer"; "sly as a fox"; "tricky Dick"; "a wily old attorney"
  • synonyms: crafty, cunning, dodgy, foxy, guileful, knavish, slick, sly, tricksy, tricky, wily