UNDENIABLE Meaning of UNDENIABLE in English [un.de.ni.able] adj (1547) 1: plainly true: incontestable 2: unquestionably excellent or genuine "an applicant with ~ references" -- un.de.ni.able.ness n -- un.de.ni.ably adv Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012