headlong

"The child's impetuous decision to quit the soccer team without talking to the coach upset his parents. "

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

"The committee's deliberation about the new school project lasted several hours. "

"The words “big” and “heavy” are English adjectives."

"it precipitated their success"

"The tide caused a recession of the ocean water, leaving the sandbars exposed. "

"The teacher unrestrained the students' imaginations during the creative writing lesson. "

"Gravity pulls everything downwards."

"Make sure all the restraints are tight."

"a precipitous cliff"

"The heavy rain was unexpected; we had planned a picnic in the park. "

"to plunge the body into water"