adjective
EXAMPLES FROM CORPUS
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Miklós, in his middle fifties, is a tall, quietly spoken but imposing figure, very self-possessed .
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She had a head of flowing auburn hair and carried herself in a self-possessed manner touching on the arrogant.
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She was no longer the dedicated, self-possessed Miss Chilcott of Yelton.
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So its final fulfilment will lie not simply in the realisation of a wholly self-possessed life.
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Until tragedy and fate catch up with her she is always mistress of the situation, coolly self-possessed .