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collected
[kə'ɫɛktəd]
the witness remained collected throughout the cross-examination
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equanimous
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poised
['pɔɪzd]
perfectly poised and sure of himself
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self-collected
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self-contained
['sɛɫfkə'nteɪnd]
more self-contained and more dependable than many of the early frontiersmen
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self-possessed
strong and self-possessed in the face of trouble