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"
characterized by careless unconcerned; "the heedless generosity and the spasmodic extravagance of persons used to large fortunes"- Edith Wharton; "reckless squandering of public funds"
If you say that someone is reckless, you mean that they act in a way which shows that they do not care about danger or the effect their behaviour will have on other people. He is charged with causing death by reckless driving. + recklessly reck·less·ly He was leaning recklessly out of the unshuttered window + recklessness reck·less·ness He felt a surge of recklessness. not caring or worrying about the possible bad or dangerous results of your actions