adverb
conclusively
adverb
1
In a way that settles the matter for good; decisively, with no room for doubt.
"The DNA test proved conclusively that he was not the father."
"Scientists have not yet shown conclusively what caused the extinction."
How to Use Conclusively
Learner’s notesIn plain EnglishIn a final, beyond-doubt way — settling a question for good.
Common pairings
prove conclusively
shown conclusively
demonstrate conclusively
Word Forms
more conclusively comparative, most conclusively superlative
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The DNA test proved _____ that he was not the father.
Etymology
From conclusive plus the adverb-forming suffix -ly.