(a.) Capable of being sustained or maintained; as, the action is not sustainable.

absolute actual admitting no question apodictic apparent attestable authenticatable certain checkable conclusive confirmable demonstratable demonstrated displayable displayed evident evincible exhibitable exhibited factual historical inappealable incontestable incontrovertible indisputable indubitable irrefragable irrefutable manifest obvious positive provable real self-evident shown substantiatable supportable sustainable testable unanswerable unconfutable undeniable unimpeachable unquestionable unrefutable validatable verifiable