Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: controvertible 'that can be argued about' (17-21 centuries), from controvert 'to dispute' (17-21 centuries), from controversy

incontrovertible

 adjective
     
in‧con‧tro‧ver‧ti‧ble
definitely true and impossible to be proved false [= indisputable]:
CCTV provided incontrovertible evidence that he was at the scene of the crime.
—incontrovertibly adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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