This is the 999th most frequent Estonian word.
kiirelt
Quickly.
In this sentence, 'kiirelt' is used as an adverb to describe the manner of the action of running, implying speed.
Ta jooksis kiirelt koju.
He ran quickly home.
Here, 'kiirelt' serves to emphasize the immediacy required in responding to an event, again functioning as an adverb.
Sa pead kiirelt reageerima, kui midagi juhtub.
You need to react quickly if something happens.
In this context, 'kiirelt' qualifies the adjective 'tehtud', conveying the notion of haste in decision-making.