The phrase "a powerful decisive" is not correct in written English as it combines two adjectives without a noun to modify.
It could be used in a context where you are describing a noun, but it needs to be restructured for clarity.
Example: "The leader made a powerful, decisive choice that changed the course of the project."
Alternatives: "a strong decision" or "a significant choice".
Moore's style, Liebling writes, is all panache and technique — the picture of "a powerful, decisive intellect unfettered by preconceptions".
Kenneth Widmerpool, an object of scorn to his classmates, emerges as a powerful, decisive force, the right man for a mean and mercenary age.
As usual, he stood up nicely, his arms close to his body and his feet not too far apart, ready to go anywhere but not without a reason — the picture of a powerful, decisive intellect unfettered by preconceptions.
It gives a picture of a powerful and decisive emperor governing with the aid of a group of talented and well-chosen chief ministers.
But in our fast-paced and highly integrated world, communication, more than ever, is a powerful and decisive force for career success.
Popular culture would have us believe that some people are born leaders - charismatic, powerful, decisive.
One would have thought that hosting the 2011 Conference of the Parties climate negotiations in Durban would have provided a powerful impetus to take decisive action.
"It is a powerful reminder of the decisive role that children can have in bringing about change and of the importance of ensuring a quality basic education for all".
In the resulting conflict, a powerful aristocratic faction scored a decisive victory in 1318.
But, advancing on the queenside where the player has a majority of the pawns, referred to as a queenside majority, can create a powerful passed pawn that may prove decisive in the late middlegame or endgame.
The public image she'd created tough, decisive, analytical had been a powerful instrument in advancing her career.
