noun
a person who seeks out and enjoys activities that are thrilling and exciting, often involving a high level of risk or danger
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The adrenalin junkie sought out extreme sports to satisfy their need for excitement.
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My friend is such an adrenalin junkie, always looking for the next thrill.
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That guy is a total adrenalin junkie, always chasing after that high.
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Being an adrenalin junkie in the business world, he thrived on high-stakes deals and risky investments.