/ ˈrekləs; NAmE / adjective
showing a lack of care about danger and the possible results of your actions
SYN rash :
He showed a reckless disregard for his own safety.
She was a good rider, but reckless.
He had always been reckless with money.
to cause death by reckless driving
► reck·less·ly adverb :
He admitted driving recklessly.
► reck·less·ness noun [ U ]
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WORD ORIGIN
Old English reccelēas , from the Germanic base (meaning care ) of reck pay heed to something .