noun
a legendary rock or mineral to which many, often contradictory, properties were attributed
adjective
refusing to be persuaded or to change one's mind
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She was adamant about following the rules and regulations.
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He's pretty adamant that we go to the new restaurant in town.
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I told him I wasn't interested, but he was adamant about hanging out.
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Despite the challenges, she remained adamant in her pursuit of success.