reckless
https://gyazo.com/81d206d76dd8d67e1be7bc2c30ce7b7a
source: guate GIF - Find & Share on GIPHY
adjective
(of a person or their actions) without thinking or caring about the consequences of an action:
〈人･行動などが〉向こう見ずな, 無謀な, 大胆な
e.g. reckless driving.
ORIGIN
Old English reccelēas, from the Germanic base (meaning ‘care’) of reck.