In-dū'bi-ta-ble1, a.
a. [Prefix in, not, and dubitable; Fr. & Sp. indubitable, It. indubitabile, Lat. indubitabilis.] Not dubitable; unquestionable; evident; apparently certain; too plain to admit of doubt.
Synonyms—Unquestionable; evident; incontrovertible; incontestable; undeniable; irrefragable.