aplomb, calmness, collectedness, composedness, composure, cool, coolness, countenance, equanimity, equilibrium, imperturbability, placidity, repose, sangfroid, serenity, tranquillity (or tranquility), tranquilness;
Synonym Discussion of self-possession
- the confidence that comes from long experience
- handled the cross-examination with complete assurance
- answered the insolent question with complete self-possession
- handled the reporters with great aplomb
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