foolhardy
     adj : marked by unthinking boldness; with 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 the World Trade
           Center" [syn: {rash}, {reckless}]
     [also: {foolhardiest}, {foolhardier}]
Source: WordNet® 2.0