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.
例句
She loved to ride; on horseback, she was reckless and utterly without fear...她喜歡騎馬；在馬背上，她縱橫馳騁，毫無畏懼。He is charged with causing death by reckless driving.他被控危險駕駛致人死亡。
英漢詞典釋義
adv.
不在乎地;魯莽地;不顧一切地
He was arrested for driving recklessly.他因魯莽開車被捕。If you drive as recklessly as that,you’ll end in hospital.要是你開車老是那樣魯莽,總有一天要住進醫院。He drove so recklessly that he collided with a tree and landed up in hospital.他開車太魯莽,結果撞到一棵樹上,最終進了醫院。