The phrase "decisively committed" is correct and can be used in written English.
It means to be fully dedicated or devoted to something in a determined and firm manner. Example: The team was decisively committed to winning the championship, and their hard work and determination paid off when they lifted the trophy.
BEIRUT, Lebanon — The leader of the powerful Lebanese militant group Hezbollah decisively committed his followers on Saturday to an all-out battle in Syria to defeat the rebellion against President Bashar al-Assad.
By this time, I had more or less decisively committed to smoking pot as a bi-hourly activity, and though I lacked the commitment to better myself as a video game player, I spent hours sitting on the couch watching people play who had a knack for negotiating the nuances of the PlayStation controller.
If anyone comes to London intending to commit criminal acts, we will act quickly, robustly and decisively".
Once battle was joined, Eisenhower acted decisively, committing the two armored divisions in the 12th Army Group's reserve over Bradley's objection, along with his own meager reserves, two airborne divisions.
To end the relationship decisively, he committed to making Regine despise him.
She urged the government to act "swiftly and decisively" to commit to the system to help reduce the danger young drivers posed to themselves and others.
"I am committed to responding decisively, and as forcefully as necessary," the Boston Fed's Rosengren said, "to ensure that long-term inflation expectations remain stable and that food and energy prices are not passing through to other prices".
By several accounts, Bishop Murphy is a gregarious, charming man, energetic and enthusiastic, a devout and learned Catholic leader steeped in church orthodoxy but committed to interfaith understanding, and a seasoned administrator who listens well and then acts decisively.
The Air Force is firmly committed to the ground support mission, using the precision technology that -- for the first time in the history of war -- permits air power to intervene decisively in the ground battle.
Since he has attempted to set up multiple working hypotheses, he is committed to the survival of no one of them, but rather is interested to see how simply they can be formulated and how decisively they can be made to compete.
