Sleekest Synonyms and Antonyms

Affectedly and self-servingly earnest
(Adjective)
Synonyms:
  1. oiliest
Having a smooth, gleaming surface reflecting light
(Adjective)
Antonyms:
  1. roughest
  2. dullest
Having slender and graceful lines
(Adjective)
Synonyms:
  1. trimmest