Boiling down to the essence of the meaning, the best word to switch recklessly for would be carelessly.
He was recklessly driving the car on the Highway.
Recklessly.
The adverb form of the word reckless is recklessly.Some example sentences are:He was pulled over for driving recklessly.They are recklessly demolishing the garage with no safety gear.
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foolhardy
The likely word is the adverb carelessly (recklessly, without concern or regard).
The definition of the word audacious is: Extremely bold or daring, recklessly brave, fearless. Extremely original, without restriction to prior ideas, highly inventive. Recklessly bold in defiance of convention, propriety, law, or the like, insolent, brazen. Lively, unrestrained, uninhibited.
Crossing the road recklessly is called JAYWALKING
The Tagalog word for "prodigal" is "nagwawaldas." It refers to someone who spends money or resources recklessly or wastefully.
Insurgents, such as the Taliban, are recklessly killing many people in Pakistan, because they are intolerant of other people's views.
You drive recklessly.
spendthrift