recklessness
n.the quality of being willing to take big risks without thinking about the possible dangers. It often describes someone who acts in a way that could hurt themselves or others.
n.the quality of acting in a way that shows no care for the dangers or the feelings of others. Often implies a lack of prudence or a deliberate disregard for safety.
“The driver's recklessness caused a serious accident.”
“The company's recklessness in ignoring safety warnings eventually led to a massive fine and a public scandal.”
“While some view the explorer's recklessness as a necessary trait for discovery, others argue that such a lack of caution is simply irresponsible and dangerous to the team.”
“It’ll probably settle down as his systems become deeper rooted but there was a sense of recklessness at times to their play.”
From Middle English reklesnes, reklesnesse, rekelesnesse (also assibilated as rechelesnes, reccheleesnesse), from Old English rēcelēasnes (“recklessness, carelessness, negligence”), equivalent to reckless + -ness.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.