The phrase "a decisive argument" is correct and usable in written English.
It can be used when referring to an argument that is clear, strong, and likely to influence a decision or outcome.
Example: "The lawyer presented a decisive argument that swayed the jury in favor of her client."
Alternatives: "a compelling argument" or "a conclusive argument".
Is this a decisive argument?
Relative volume errors are therefore often used as a decisive argument to select one exchange correlation functional over another.
The enterprise's triple impact (social, environmental and economic) was a decisive argument for the jury.
This, however, is not a decisive argument against Kant's Categorical Imperative for several reasons.
An editorial accompanying the new paper in JAMA seems to reach the conclusion that the WHI is a decisive argument against hormone replacement for all women.
The late-stage dysfunction of the Soviet economy certainly contributed to the demise of that empire, but to view this as a decisive argument for unrestrained capitalism is just counter-historical.
A toxic cocktail of dioxin, sewage, heavy metals and industrial chemicals left behind by the factories, tanneries, smelters and refineries that are now mostly hulking brick ruins, the Passaic is a pretty decisive argument against human perfectibility.
The study by Davila et al. [ 3] contributes a potentially decisive argument by connecting the plant mtDNA mutation rate to yet another intriguing feature of this organellar genome-recombination. Unlike in animal mitochondria, recombination is widespread in plant mtDNA.
These findings provide an additional, perhaps decisive, argument in a dispute as to whether LPS-induced hypothermia is a passive consequence of peripheral vasodilation and uncontrolled heat loss or, alternatively, whether it is a brain-mediated response.
But that wasn't the decisive argument, not in political Washington.
I completely forgot Hume's to my mind decisive argument against all evidence for the miraculous.
