1. (a.) Not dubitable or doubtful; too evident to admit of doubt; unquestionable; evident; apparently certain; as, an indubitable conclusion.

2. (n.) That which is indubitable.

absolute actual admitting no question apparent bona fide clear clear as crystal confirmable crystal-clear demonstrable demonstratable discernible distinct down evident explicit express factual flat genuine historical inappealable incontestable incontrovertible indisputable irrefragable irrefutable manifest noticeable observable obvious open-and-shut palpable patent perceivable perceptible perspicuous plain plain as day provable real seeable self-evident self-explaining self-explanatory sure-enough tangible testable to be seen TRUE unanswerable unconfutable undeniable undoubted unimpeachable unmistakable unquestionable unrefutable verifiable veritable visible