"slicker" in the noun sense
1. oilskin, slicker
a macintosh made from cotton fabric treated with oil and pigment to make it waterproof
2. slicker
a person with good manners and stylish clothing
3. deceiver, cheat, cheater, trickster, beguiler, slicker
someone who leads you to believe something that is not true
"slicker" in the adjective sense
1. slick
made slick by e.g. ice or grease
"sidewalks slick with ice"
"roads are slickest when rain has just started and hasn't had time to wash away the oil"
2. facile, neat, slick
superficially impressive, but lacking depth and attention to the true complexities of a subject
"too facile a solution for so complex a problem"
"it was a neat plan, but bound to fail"
"a slick advertising campaign"
3. glib, pat, slick
having only superficial plausibility
"glib promises"
"a slick commercial"
4. satiny, sleek, silken, silky, silklike, slick
having a smooth, gleaming surface reflecting light
"glossy auburn hair"
"satiny gardenia petals"
"sleek black fur"
"silken eyelashes"
"silky skin"
"a silklike fabric"
"slick seals and otters"
5. crafty, cunning, dodgy, foxy, guileful, knavish, slick, sly, tricksy, tricky, wily
marked by skill in deception
"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"
Source: WordNet® (An amazing lexical database of English)
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