unquestionable
definition
not able to be disputed or doubted
example
The scientist presented unquestionable evidence that climate change is impacting our environment.
synonyms
indisputableundeniableirrefutable
word origin — The word 'unquestionable' originates from the prefix 'un-' meaning 'not', combined with 'questionable', which comes from 'question' and the suffix '-able' meaning 'capable of being'. The root 'question' derives from the Latin 'quaestio' meaning 'a seeking, inquiry or question'.