1.NounA person who engages in very risky behavior, especially one who is motivated by a craving for excitement or attention. .mw-parser-output .defdate{font-size:smaller}
"Even as a youngster, Steven was a bit of a daredevil riding up homemade wooden ramps on his BMX."
2.AdjectiveRecklessly bold; adventurous.
"The climactic scene of “Rebel without a Cause” is the group of very daredevil teens playing chicken."
3.VerbTo behave in a reckless, adventurous, or physically risky manner.