"reckless" in the adjective sense

1. foolhardy, heady, rash, reckless

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"

2. heedless, reckless

characterized by careless unconcern

"the heedless generosity and the spasmodic extravagance of persons used to large fortunes"- Edith Wharton

"reckless squandering of public funds"

Source: WordNet® (An amazing lexical database of English)

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