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Definition of self-possessed : Composed or tranquill in mind, manner, etc.; undisturbed.

Synonyms:

smooth, unperturbed, placid, confident, sedate, unruffled, dispassionate, composed, peaceful, self-confident, calm, undisturbed, gathered, imperturbable, secure, self-contained, still, self-assured, reserved, poised, tranquil, self-collected, aloof, cool, serene, quiet, assured, attitude, equanimous, collected, belief