noun
a person with whom one shares a secret or private matter, trusting them not to repeat it to others
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She trusted her confidant with all her secrets and personal thoughts.
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I always turn to my best friend as my confidant whenever I need advice.
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I spill all my tea to my confidant because I know they won't judge me.
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In the world of chess, the queen is considered the king's confidant and most trusted advisor.