open-and-shut

open-and-shut
    adj 1: so obvious as to be easily solved or decided; "an open-
           and-shut case"
    

53 Moby Thesaurus words for "open-and-shut":
      apparent, ascertained, assured, attested, certified, clear,
      clear as crystal, crystal-clear, decided, determinate, determined,
      discernible, distinct, established, evident, explicit, express,
      fixed, guaranteed, in the bag, indisputable, indubitable,
      made sure, manifest, nailed down, noticeable, observable, obvious,
      on ice, palpable, patent, perceivable, perceptible, perspicuous,
      plain, plain as day, proved, secure, seeable, self-evident,
      self-explaining, self-explanatory, set, settled, stated,
      straightforward, tangible, tested, to be seen, tried, unmistakable,
      visible, warranted