(s)clean, neatfree 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)facile, neat, slicksuperficially 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”