a reckless impetuous irresponsible person
"The daredevil decided to drive off the cliff without checking if there was another way down, proving he had no regard for his own safety."
A person who engages in very risky behavior, especially one who is motivated by a craving for excitement or attention.
"The daredevil skater jumped off the roof just to see if he could pull off the trick before everyone lost interest."
To behave in a reckless, adventurous, or physically risky manner
"The daredevil decided to base jump off the cliff without any safety gear."
Recklessly bold; adventurous.
"The daredevil bungee jumped off the highest bridge without a safety harness, proving just how recklessly bold he could be."