open-and-shut (adj.)

• apparent
• ascertained
• assured
• attested
• certified
• clear
• decided
• determinate
• determined
• discernible
• distinct
• established
• evident
• explicit
• express
• fixed
• guaranteed
• indisputable
• indubitable
• manifest
• noticeable
• observable
• obvious
• palpable
• patent
• perceivable
• perceptible
• perspicuous
• plain
• proved
• secure
• seeable
• self-evident
• self-explanatory
• set
• settled
• stated
• straightforward
• tangible
• tested
• tried
• unmistakable
• visible
• warranted