reckless

"The sign said the next town was 20 miles away, so we knew it would be a long drive. "

"My sister was careless about her deadlines, often turning in assignments late. "

"He was in that headstrong teenage phase when he felt like he knew everything."

"The divers encountered a huge school of mackerel."

"You drive nails into wood with a hammer."

"to die by an accident"

"Sing we joyous, all together, heedless of the wind and weather."

"The indifferent student didn't care about the upcoming exam. "

"rash words spoken in the heat of debate"

"Walking home from school late at night poses a danger to your safety. "

"The lightning caused thunder."

"If you don't study for the test, the consequences will be a bad grade. "