sleek vs streamlined

sleek and streamlined both are adjectives.

Word	Noun	Adjective	Verb	Adverb
sleek	No	Yes	Yes	No
streamlined	No	Yes	No	No

As adjectives, sleek and streamlined are synonyms defined as:

sleek and streamlined: designed or arranged to offer the least resistance to fluid flow

Other synonyms of sleek include aerodynamic, flowing.

sleek (adjective)	streamlined (adjective)
having a smooth, gleaming surface reflecting light; being of a smooth, soft and lustrous quality, resembling silk	made efficient by stripping off nonessentials
well-groomed and neatly tailored; especially too well-groomed	designed or arranged to offer the least resistance to fluid flow
designed or arranged to offer the least resistance to fluid flow

sleek (verb)	streamlined (verb)
make slick or smooth