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slick

1 slick /ˈslɪk/ adjective
slicker; slickest
1 slick
/ˈslɪk/
adjective
slicker; slickest
Britannica Dictionary definition of SLICK
[also more slick; most slick]
: very smooth and slippery
: clever in usually a dishonest or deceptive way
: skillful and clever
: very good : of the highest quality

— slickness

noun [noncount]
2 slick /ˈslɪk/ verb
slicks; slicked; slicking
2 slick
/ˈslɪk/
verb
slicks; slicked; slicking
Britannica Dictionary definition of SLICK
[+ object]
: to make (something) smooth and slippery

slick back/down

[phrasal verb]
slick back/down (hair) or slick (hair) back/down
: to pull (hair) back and make it look smooth or shiny by using water or some wet substance (such as hair gel)
3 slick /ˈslɪk/ noun
plural slicks
3 slick
/ˈslɪk/
noun
plural slicks
Britannica Dictionary definition of SLICK
[count]
: a thin layer of liquid that makes a surface very slippery
especially : oil slick
: a smooth tire that is used in car racing