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Boiling down to the essence of the meaning, the best word to switch recklessly for would be carelessly.
foolhardy
He was recklessly driving the car on the Highway.
Crossing the road recklessly is called JAYWALKING
Recklessly.
I was looking for this for a crossword - I think HELLBENT might fit the bill. 8 letters foolhardily confident right? TEMERITY in a nutshell.
You drive recklessly.
spendthrift
A road hog.
slash
A danger on the road.
As a modifier to the verb. Sentence: "The boy was running through traffic". Using the adverb "recklessly" as an adverb: "The boy was recklessly running through traffic".