The Oxford Thesaurus An A-Z Dictionary of Synonyms - sleek adj.

1) smooth, slick, velvety, lustrous, shiny, shining, glossy, silky, silken: The seals' sleek fur glistened in the sunlight. 2) graceful, trim, streamlined: For her birthday Edmund gave her a sleek convertible. 3) suave, unctuous, slimy, fawning, oily, specious, hypocritical, Chiefly Brit smarmy: His explanations sounded plausible enough, but we soon found out what a sleek rogue he really was.