In a conclusive manner; with finality.
The word 'conclusively' is correct and usable in written English. You can use it when you want to express that something is proven or settled beyond doubt. For example: "The results of the study conclusively proved that the treatment was effective".
The conclusion will not, however, delight Nasdaq, which has yet to prove conclusively that its electronic systems provide a superior marketplace.
We have not conclusively agreed, in 2015, that women have the right to walk the streets, wearing whatever they choose, without being shouted and whistled at.
Even if studies conclusively showed that 20, or 50, was the perfect class size, politicians couldn't click fingers and be done with it.
"If we prove conclusively that mindfulness can stabilise those individuals it would be a great benefit to society".
Given such a natural history, a "miraculous cure" in a case of multiple sclerosis would indeed be very hard to prove conclusively.
Saudi Arabia beheads smugglers of cannabis, a drug which is not conclusively linked to a single fatality among the 200m or so who use it each year.
This year's battle has been between two deeply flawed men: George Bush, who has been a radical, transforming president but who has never seemed truly up to the job, let alone his own ambitions for it; and John Kerry, who often seems to have made up his mind conclusively about something only once, and that was 30 years ago.
When I feel like I can't trust my brain 100%, Ludwig really comes in handy. It makes me translate and proofread faster and my output more reliable.
Claudia Letizia
Head Translator and Proofreader @ organictranslations.eu