"Decisive" means being able to make decisions quickly and confidently, in order to solve a problem or move forward in a certain direction. Full definition
A new level of decisive action is required now to achieve real emissions reductions. (sciencemediacentre.org)
This edition focuses on health and healthcare as decisive factors in determining the extent of harm countries will experience in the wake of a natural hazard. (uncclearn.org)
But whether these occur is not decisive for our response. (religion-online.org)