believable

authentic conceivable convincing credible persuasive plausible reasonable satisfying

able to hold water feasible logical sound

aboveboard acceptable colorable credential creditable imaginable impressive likely possible presumable presumptive probable rational reliable straight supposable tenable tried trustworthy trusty unquestionable up front

implausible improbable inconceivable incredible unbelievable unimaginable unlikely unreasonable

unbelieveable unconvincing unreliable unthinkable