noun
A person who is self-possessed.
adjective
Having or showing control of one's feelings, behavior, or actions; composed and confident.
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She remained self-possessed throughout the entire meeting, never once losing her composure.
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Even in the most chaotic situations, he always manages to stay self-possessed.
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Dude, I wish I could be as self-possessed as her in stressful situations.
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His self-possessed demeanor was like a shield, protecting him from the chaos around him.