noun
a tough or uncompromising person
adjective
tough, uncompromising, or difficult to deal with
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The detective was able to crack the case wide open with the help of a hardcase witness.
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My uncle is a real hardcase when it comes to negotiating deals.
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That guy is such a hardcase, he never listens to anyone else's opinion.
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Dealing with my stubborn boss is like trying to break through a hardcase shell.