The phrase "a decisive outcome" is correct and usable in written English.
It can be used when referring to a result or conclusion that is clear and leaves no room for doubt or ambiguity.
Example: "The negotiations ended with a decisive outcome, ensuring that both parties were satisfied with the agreement."
Alternatives: "a conclusive result" or "a clear resolution".
The government has promised an investigation; few pin any hopes on a decisive outcome.
Given this depressing state of affairs, a decisive outcome for either side would be unacceptable for the United States.
Though turnout for the March parliamentary election was relatively high, the vote failed to produce a decisive outcome.
Facing public pressure to stop the violence, Washington may soon embark on an incremental intervention that would gradually deepen American involvement without producing a decisive outcome.
A close result in France might just open the possibility of a rerun, though the government has ruled this out; a decisive outcome would close that option off.
A senior British official acknowledged that discussions between London, Brussels and Washington had been going on for months with the aim of unblocking the supply of medicines, but without a decisive outcome.
From a teleological perspective, it is likely that the all-or-none nature of Outcome I events could be a decisive event on the outcome of host-microbe cellular interactions.
Anti-government or satirical clips on YouTube are unlikely to have a decisive effect on the outcome of the forthcoming elections.
By the late 15th century, however, English armies were somewhat backward by wider European standards; the Wars of the Roses were fought by inexperienced soldiers, often with outdated weapons, allowing the European forces which intervened in the conflict to have a decisive effect on the outcomes of battles.
They had given the Pentagon sceptics a bloody nose and proved that "weekend warriors" are perfectly capable of engaging in full-scale armoured combat whenever Uncle Sam needs them.Unfortunately, not every battle in the relentless conflict between the full-time American army and the Army National Guard, a mostly part-time force with strong local roots, has such a rapid and decisive outcome.
"It is conceivable that the decisive outcome to the election could encourage a pick-up in instructions to agents and ease some of the recent upward pressure on house prices, but it is doubtful that this will be substantive enough to provide anything more than temporary relief.
