S: (adj) clean, neat (free from clumsiness; precisely or deftly executed) "he landed a clean left on his opponent's cheek"; "a clean throw"; "the neat exactness of the surgeon's knife"
S: (adj) facile, neat, slick (superficially impressive, but lacking depth and attention to the true complexities of a subject) "too facile a solution for so complex a problem"; "it was a neat plan, but bound to fail"; "a slick advertising campaign"