foolhardy

"He unthinkingly forgot to bring his lunch to school. "

"The teacher marked the student's paper with a red pen. "

"The weather was extremely hot today; we stayed inside all afternoon. "

"My brother is very hotheaded; he gets angry easily if things don't go his way. "

"We are going hiking in the mountains this weekend for fun and exercise. "

"He is a student of life."

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

"His complete disregard for the safety rules led to an accident. "

""The baseball game was canceled because a severe thunderstorm was approaching." "

"To boldly go where no man has gone before."

"After careful consideration, the student made a decision about which college to attend. "

"His recklessness repeatedly put him in danger."