decisively is a form of:

Decisive



adjective
1.
(Setting something conclusively. they settles a dispute, etc., critically important) decisive person ដែលមិនចេះរារែក
Example: A decisive battle ended the war, A leader must be decisive in a crisis.decisive action ដែលមិនរួញរា, decisive factor ដែលសម្រេច, ដែលផ្ដាច់ព្រាត់