Adjective
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characterized by careless unconcern
"the heedless generosity and the spasmodic extravagance of persons used to large fortunes"- Edith Wharton
"reckless squandering of public funds"
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marked by defiant disregard for danger or consequences
"foolhardy enough to try to seize the gun from the hijacker"
"became the fiercest and most reckless of partisans"-Macaulay
"a reckless driver"
"a rash attempt to climb Mount Everest"