sleek

UK: /ˈsliːk/ US: /slik/ ,(slēk)

Inflections of 'sleek' (adj):

sleeker

adj comparative

sleekest

adj superlative

WordReference Random House Learner's Dictionary of American English © 2026

sleek¹ /slik/   adj., -er, -est. 

1. smooth or glossy, such as hair:
   sleek, combed-back hair.
2. well-fed or well-groomed:
   looking sleek and healthy.
3. finely shaped;
   streamlined:
   a sleek sports car.
4. smooth in manners, speech, etc.;
   suave.

sleek•ly, adv. 
sleek•ness, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2026

sleek¹  (slēk), adj., -er, -est. 

1. smooth or glossy, as hair, an animal, etc.
2. well-fed or well-groomed.
3. trim and graceful;
   finely contoured;
   streamlined:
   a sleek sports car.
4. smooth in manners, speech, etc.;
   suave.
5. cleverly or deceitfully skillful;
   slick:
   a sleek confidence man.

• variant of slick¹ 1580–90

sleek′ly, adv. 
sleek′ness, n. 
Synonyms

• 5. . smooth, suave.

sleek²  (slēk), v.t. 

1. to make sleek;
   smooth;
   slick:
   to sleek leather.

Also, sleek′en. 

• late Middle English sleken, variant of slick² 1400–50

sleek′er, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

sleek / sliːk/ adjective

1. smooth and shiny; polished
2. polished in speech or behaviour; unctuous
3. (of an animal or bird) having a shiny healthy coat or feathers
4. (of a person) having a prosperous appearance

verb (transitive)

1. to make smooth and glossy, as by grooming, etc
2. (usually followed by over) to cover (up), as by making more agreeable; gloss (over)

Etymology: 16th Century: variant of slick

ˈsleekly adverb

ˈsleekness noun

ˈsleeky adjective