reckless
     adj 1: 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: {foolhardy}, {rash}]
     2: characterized by careless unconcerned; "the heedless
        generosity and the spasmodic extravagance of persons used
        to large fortunes"- Edith Wharton; "reckless squandering
        of public funds" [syn: {heedless}]
Source: WordNet® 2.0