adjective
1. not physically disturbed or set in motion
• Ant: ↑agitated
• Similar to: ↑nonturbulent, ↑unstirred
2. not agitated or disturbed emotionally
• Ant: ↑agitated
3. not agitated; without losing self-possession
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spoke in a calm voice
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remained calm throughout the uproar
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he remained serene in the midst of turbulence
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a serene expression on her face
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she became more tranquil
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tranquil life in the country
• Similar to: ↑composed
Useful english dictionary. 2012.