Etymology
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sleek (adj.)

1580s, variant of Middle English slike (see slick (adj.)). Originally of healthy-looking animal hair; applied to persons 1630s, with sense of "plump and smooth-skinned." Figurative meaning "slick, fawning, flattering" is from 1590s.

sleek (v.)

"make sleek," mid-15c., a variant of slick (v.). Related: Sleeked; sleeking.

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Definitions of sleek
1
sleek (adj.)
well-groomed and neatly tailored; especially too well-groomed;
sleek figures in expensive clothes
sleek (adj.)
designed or arranged to offer the least resistant to fluid flow;
Synonyms: streamlined / aerodynamic / flowing
2
sleek (v.)
make slick or smooth;
Synonyms: slick
From wordnet.princeton.edu