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