slick

Smooth. This is usually called an Americanism, but is a very old sea-term. In the Book for Boys and Girls, 1686, it is aptly illustrated:

"The mole's a creature very smooth and slick,

She digs i' th' dirt, but 'twill not on her stick."

Slick
·adj Sleek; smooth. II. Slick ·noun A wide paring chisel. III. Slick ·vt To make sleek or smoth. ...

Webster's Dictionary of the English Language
slick
The popular pronunciation of sleek, and so written by some authors.--Webster. It is also used adverb...

Dictionary of American Words And Phrases by John Russell Bartlett.
to slick up
To dress up; to make fine. Mrs. Flyer was slicked up for the occasion, in the snuff-colored silk sh...

Dictionary of American Words And Phrases by John Russell Bartlett.
slick as grease
Another classical expression, conveying the same idea as the foregoing. ...

Dictionary of American Words And Phrases by John Russell Bartlett.
slick as a whistle
A proverbial simile, in common use throughout the United States. To do anything as slick as a whistl...

Dictionary of American Words And Phrases by John Russell Bartlett.