noun
a person who strongly maintains their beliefs or loyalty to a particular cause or person
adjective
having or showing a firm determination or loyalty that is very difficult to change
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The die hard fans of classical music were thrilled to attend the symphony performance.
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I'm a die hard fan of that TV show, I never miss an episode!
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She's a die hard gamer, she plays for hours on end.
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His die hard determination to succeed propelled him through any obstacle in his path.