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Smooth and lustrous as if polished; glossy: brushed her hair until it was sleek.
(adjective)
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Well-groomed and neatly tailored.
(adjective)
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Healthy or well-fed; thriving.
(adjective)
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Polished or smooth in manner, especially in an unctuous way; slick.
(adjective)
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To make sleek; slick: sleeked his hair with pomade.
(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.