adjective
an adjective is a word that describes or modifies a noun or pronoun. In this case, 'falsehearted' describes someone who is deceitful or insincere.
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It is important to be cautious of falsehearted individuals in positions of power.
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I heard she's been hanging out with some falsehearted people lately.
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Don't trust him, he's totally falsehearted.
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The storm clouds gathered above, a falsehearted promise of rain.