Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
slick [slɪk] adj (performance) гла́дкий#; (salesman, answer) бо́йкий*бо́ек
n (also: oil slick) плёнка не́фти
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: